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-7x+8=-3x-8
We move all terms to the left:
-7x+8-(-3x-8)=0
We get rid of parentheses
-7x+3x+8+8=0
We add all the numbers together, and all the variables
-4x+16=0
We move all terms containing x to the left, all other terms to the right
-4x=-16
x=-16/-4
x=+4
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