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8=12+13x
We move all terms to the left:
8-(12+13x)=0
We add all the numbers together, and all the variables
-(13x+12)+8=0
We get rid of parentheses
-13x-12+8=0
We add all the numbers together, and all the variables
-13x-4=0
We move all terms containing x to the left, all other terms to the right
-13x=4
x=4/-13
x=-4/13
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