Question

me ajudem a resolver estas continhas!!

Answer 1

a)
$\frac{2x}{3} + 5 = 9$
|-5
$\frac{2x}{3} = 4$
|*3
$2x = 12$
|÷2
$x = 6$

b)
$2x - 50 = - 10$
|+50
$2x = 40$
|÷2
$x = 20$


c)
$x + 2x = 30$
$3x = 30$
|÷3
$x = 10$


d)
$2 {x}^{2} = 72$
|÷2
${x}^{2} = 36$
|√
$x = 6$