Question

o valor de X na equação de 1° grau - 3 (x - 5) -2 (2x+1) = - 8​

Answer 1

Explicação passo-a-passo:

-3.(x-5)-2.(2x+1)=-8

-3x+15-4x-2=-8

-3x-4x+15-2=-8

-7x+13=-8

-7x=-8-13

-7x=-21 .(-1)

7x=21

x=21/7

x=3

Answer 2

$\color{dodgerblue} { - 3(x - 5) - 2(2x + 1)} \\ = \color{dodgerblue}{ - 8} \\ \color{dodgerblue}{} - 3x + 15 - 4x - 2 = - 8$

$\color{dodgerblue}{ - 7x = - 15 + 2 - 8} \\ \color{dodgerblue}{ - 7x = - 21} \times ( - 1) \\ \color{dodgerblue}{7x = 21}$

$\color{dodgerblue}{x = \frac{21}{7} } \\ \color{dodgerblue}{x = 3} \color{lime}{\checkmark}$