Question

gente manda uma equação do 7 ano tipo assim
5(x+3)-2(x-1)=20​

Answer 1

Olá

$\LARGE{}5(x + 3) - 2(x - 1) = 20\\ \LARGE{}5x + 15 - 2(x - 1) = 20 \\ \LARGE{}5x +15 - 2x + 2 = 20 \\ \LARGE{}3x + 15 + 2 = 20 \\ \LARGE{}3x + 17 = 20 \\ \LARGE{}3x = 20 - 17 \\ \LARGE{}3x = 3 \\ \LARGE\boxed{\LARGE{}x = 1}$

$\LARGE{}10(x + 1) - 5(x - 2) = 70 \\ \LARGE{}10x + 10 - 5(x - 2) = 70 \\ \LARGE{}10x + 10 - 5x + 10 = 70 \\ \LARGE{}5x + 10 + 10 = 70 \\ \LARGE{}5x + 20 = 70 \\ \LARGE{}5x = 70 - 20 \\ \LARGE{}5x = 50 \\ \LARGE{}\LARGE\boxed{x = 10}$

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