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5x+4=-2x-8
We move all terms to the left:
5x+4-(-2x-8)=0
We get rid of parentheses
5x+2x+8+4=0
We add all the numbers together, and all the variables
7x+12=0
We move all terms containing x to the left, all other terms to the right
7x=-12
x=-12/7
x=-1+5/7
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