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-10x+18+9x=12x-13
We move all terms to the left:
-10x+18+9x-(12x-13)=0
We add all the numbers together, and all the variables
-1x-(12x-13)+18=0
We get rid of parentheses
-1x-12x+13+18=0
We add all the numbers together, and all the variables
-13x+31=0
We move all terms containing x to the left, all other terms to the right
-13x=-31
x=-31/-13
x=2+5/13
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