Question

URGENTEE ATÉ AMANHÃ ​

Answer 1

Explicação passo-a-passo:

A)

$3x + 6 = x - 8$

$3x - x = - 8 - 6$

$2x = - 14$

$x = - \dfrac{14}{2}$

x=-7

B)

$\dfrac{x}{4} + 20 = \dfrac{x}{3}$

$3x + 240 = 4x$

$3x - 4x = 240$

$- x = - 240( - 1)$

x=240

C)

$5(x + 2) - 3(x + 6) = 40$

$5x + 10 - 3x - 18 = 40$

$2x - 8 = 40$

$2x = 40 + 8$

$2x = 48$

$x = \dfrac{48}{2}$

x=24

D)

$\dfrac{2x}{5} - \dfrac{3}{4} = \dfrac{3x}{20}$

$8x - 15 = 3x$

$8x - 3x = 15$

$5x = 15$

$x = \dfrac{15}{5}$

x=3