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-31+19=-4x+8x
We move all terms to the left:
-31+19-(-4x+8x)=0
We add all the numbers together, and all the variables
-(+4x)-31+19=0
We add all the numbers together, and all the variables
-(+4x)-12=0
We get rid of parentheses
-4x-12=0
We move all terms containing x to the left, all other terms to the right
-4x=12
x=12/-4
x=-3
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