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google search
Google search results:
1: https://www.quora.com/If-7-is-added-to-six-times-a-number-the-result-is-22-What-is-the-number
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2: https://www.analyzemath.com/middle_school_math/grade_8/application_equations_sol.html
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3: https://socratic.org/questions/if-a-number-is-added-to-twice-its-square-the-result-is-6-how-do-you-find-the-num
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4: https://louisianabelieves.com/docs/default-source/assessment/grade-4-math-answer-key.pdf?sfvrsn=ce2f9b1f_2
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5: https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/IntermediateAlgebra-SAG.pdf
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6: https://www.westada.org/cms/lib8/ID01904074/Centricity/Domain/781/Module%204%20lessons%201to%204%20answers.pdf
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7: https://www.khanacademy.org/math/8th-engage-ny/engage-8th-module-4/8th-module-4-topic-d/v/addition-elimination-method-4
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8: http://jnsilva.ludicum.org/HMR13_14/536.pdf
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9: https://books.google.com/books?id=iQZEsfFq6MgC&pg=PA202&lpg=PA202&dq=Ninteen+times+an+integer+number+is+equal+to+thirteen+times+its+square+added+to+six.+Which+is+the+number?%0A1%0A13%0A19%0AReset+Answer&source=bl&ots=yGh1iN0KJg&sig=ACfU3U2DzkN9eAPmSJeC0ADDBwA0l4t5yQ&hl=en&sa=X&ved=2ahUKEwjetfeKvt_yAhWGQc0KHed1AswQ6AF6BAgSEAM
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10: https://economics.mit.edu/files/16496
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