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3x-4=-8x-15
We move all terms to the left:
3x-4-(-8x-15)=0
We get rid of parentheses
3x+8x+15-4=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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