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-8=x/7+13
We move all terms to the left:
-8-(x/7+13)=0
We get rid of parentheses
-x/7-13-8=0
We multiply all the terms by the denominator
-x-13*7-8*7=0
We add all the numbers together, and all the variables
-1x-147=0
We move all terms containing x to the left, all other terms to the right
-x=147
x=147/-1
x=-147
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