Question

1- Calcule o valor de x.

a) 3( x + 2 ) = 2 ( x – 7)

Answer 1

a)

3(x + 2) = 2(x - 7)

3x + 6 = 2x - 14

3x - 2x = - 14 - 6

x = - 20

b)

(2x + 5)/3 = 3

2x + 5 = 3 . 3

2x = 9 - 5

2x = 4

x = 4/2

x = 2

Resposta:

a) x = - 20

b) x = 2

Answer 2

Explicação passo-a-passo:

a)

$\alpha 3.(x+2)=2.(x-7)\\\\3x+6=2x-14\\\\3x-2x=-14-6\\\\\boxed{\boxed{x=-20}}$

b)

$\dfrac{2x+5}{3}=3\\\\2x+5=3.3\\\\2x+5=9\\\\2x=9-5\\\\2x=4\\\\x=\dfrac{4}{2}\\\\\boxed{\boxed{x=2}}$