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31-8x=19+4x
We move all terms to the left:
31-8x-(19+4x)=0
We add all the numbers together, and all the variables
-8x-(4x+19)+31=0
We get rid of parentheses
-8x-4x-19+31=0
We add all the numbers together, and all the variables
-12x+12=0
We move all terms containing x to the left, all other terms to the right
-12x=-12
x=-12/-12
x=1
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