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-7-8x=3x+4
We move all terms to the left:
-7-8x-(3x+4)=0
We get rid of parentheses
-8x-3x-4-7=0
We add all the numbers together, and all the variables
-11x-11=0
We move all terms containing x to the left, all other terms to the right
-11x=11
x=11/-11
x=-1
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