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5x+25=-8x-66
We move all terms to the left:
5x+25-(-8x-66)=0
We get rid of parentheses
5x+8x+66+25=0
We add all the numbers together, and all the variables
13x+91=0
We move all terms containing x to the left, all other terms to the right
13x=-91
x=-91/13
x=-7
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