Question

12 + 2n = 9 ( n - 7 ) -2
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Answer 1

$\LARGE\tt{}12 + 2n = 9\left(n - 7\right) - 2 \\\LARGE\tt{}12 + 2n = 9n - 63 - 2 \\ \LARGE\tt{}12 + 2n = 9n - 65 \\ \LARGE\tt{}12 + 2n - 9n = - 65 \\ \LARGE\tt{}2n - 9n = - 65 - 12 \\ \LARGE\tt{} - 7n = - 65 - 12 \\ \LARGE\tt{} - 7n = - 77 \\\LARGE\tt{} - 7n \div \left( - 7\right) = - 77 \div\left( - 7\right) \\ \LARGE\tt{}n = - 77 \div \left( - 7\right) \\ \LARGE\tt{}n = 77 \div 7 \\ \LARGE\tt{} \boxed{n = 11}$

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