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10(x-12)-11=31x-299
We move all terms to the left:
10(x-12)-11-(31x-299)=0
We multiply parentheses
10x-(31x-299)-120-11=0
We get rid of parentheses
10x-31x+299-120-11=0
We add all the numbers together, and all the variables
-21x+168=0
We move all terms containing x to the left, all other terms to the right
-21x=-168
x=-168/-21
x=+8
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