Question

Qual a resposta da equações
a) 40-20+2x=10
b) 20-10+2x=20
c) 40-10+4x=10
Me ajudem pfvr

Answer 1

a)
$20 + 2x = 10 \\ 2x = 10 - 20 \\ 2x = - 10 \\ x = \frac{ - 10}{2} \\ x = - 5$
b)
$10 + 2x = 20 \\ 2x = 20 - 10$
$2x = 10$
$x = \frac{10}{2}$

$x = 5$
c)
$30 + 4x = 10$
$4x = 10 - 30$
$4x = - 20$
$x = \frac{ - 20}{4}$
$x = - 5$