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31-8x=12+11x
We move all terms to the left:
31-8x-(12+11x)=0
We add all the numbers together, and all the variables
-8x-(11x+12)+31=0
We get rid of parentheses
-8x-11x-12+31=0
We add all the numbers together, and all the variables
-19x+19=0
We move all terms containing x to the left, all other terms to the right
-19x=-19
x=-19/-19
x=1
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