Question

Preciso do resultado das equações e delas feitas (por favor) :

A) 2x+90=30-4x

B) 20-2x=50-4x

C) 100-4x=50-6x

D) 8x-100=300-2x

Answer 1

A) 2x+90=30-4x
2x-4x= 30-90
-2x= -60 ×(-1)
2x=60
x=60/2
x=30

B) 20-2x=50-4x
-2x+4x= 50-20
2x= 30
x= 30/2
x= 15

C)100-4x=50-6x
-4x+6x= 50-100
2x= -50
x= -50/2
x= -25

D) 8x-100= 300-2x
8x+2x= 100+300
10x=400
x=400/10
x=40