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8x+40=-3x-4
We move all terms to the left:
8x+40-(-3x-4)=0
We get rid of parentheses
8x+3x+4+40=0
We add all the numbers together, and all the variables
11x+44=0
We move all terms containing x to the left, all other terms to the right
11x=-44
x=-44/11
x=-4
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