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
A) 2x+90=30-4x
B) 20-2x=50-4x
C) 100-4x=50-6x
D) 8x-100=300-2x
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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