Question

resolva as equações abaixo:
c)7x-2-5x=18
d)3(2x-2)=2(x+3)
e)10x+6-2x=-2x-4​

Answer 1

Resposta:

c) 7x - 2 - 5x = 18

$7x-5x=18+2\\ \\ 2x=20\\ \\ x=\frac{20}{2} \\ \\ x=10$

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

$3.(2x)-3.2=2.x+2.3\\ \\ 6x-6=2x+6\\ \\ 6x-2x=6+6\\ \\ 4x=12\\ \\ x=\frac{12}{4} \\ \\ x=3$

e) 10x + 6 - 2x = - 2x - 4​

$10x-2x+2x=-4-6\\ \\ 10x=-10\\ \\ x=\frac{-10}{10} \\ \\ x=-1$