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15-8x=31-4x
We move all terms to the left:
15-8x-(31-4x)=0
We add all the numbers together, and all the variables
-8x-(-4x+31)+15=0
We get rid of parentheses
-8x+4x-31+15=0
We add all the numbers together, and all the variables
-4x-16=0
We move all terms containing x to the left, all other terms to the right
-4x=16
x=16/-4
x=-4
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