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31+11x=99-8x
We move all terms to the left:
31+11x-(99-8x)=0
We add all the numbers together, and all the variables
11x-(-8x+99)+31=0
We get rid of parentheses
11x+8x-99+31=0
We add all the numbers together, and all the variables
19x-68=0
We move all terms containing x to the left, all other terms to the right
19x=68
x=68/19
x=3+11/19
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