Question

Quanto é -x+40=4x e por que?

Answer 1

$\LARGE\tt{} - x + 40 = 4x \\ \LARGE\tt{} - x = 4x - 40 \\ \LARGE\tt{} - x - 4x = - 40 \\ \LARGE\tt{} - 5x = - 40 \\\LARGE\tt{} - 5x( - 5) = - 40 \div ( - 5) \\ \LARGE\tt{}x = - 40 \div ( - 5) \\ \LARGE\tt{}x = 40 \div 5 \\ \LARGE\tt{}x = 8 \\ \\ \LARGE\tt{}s: \{8 \}$

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