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8x+40=-2x+4
We move all terms to the left:
8x+40-(-2x+4)=0
We get rid of parentheses
8x+2x-4+40=0
We add all the numbers together, and all the variables
10x+36=0
We move all terms containing x to the left, all other terms to the right
10x=-36
x=-36/10
x=-3+3/5
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