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-8=x/7+4
We move all terms to the left:
-8-(x/7+4)=0
We get rid of parentheses
-x/7-4-8=0
We multiply all the terms by the denominator
-x-4*7-8*7=0
We add all the numbers together, and all the variables
-1x-84=0
We move all terms containing x to the left, all other terms to the right
-x=84
x=84/-1
x=-84
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