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2x+8=-10x-40
We move all terms to the left:
2x+8-(-10x-40)=0
We get rid of parentheses
2x+10x+40+8=0
We add all the numbers together, and all the variables
12x+48=0
We move all terms containing x to the left, all other terms to the right
12x=-48
x=-48/12
x=-4
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