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80-5x=-15x
We move all terms to the left:
80-5x-(-15x)=0
We get rid of parentheses
-5x+15x+80=0
We add all the numbers together, and all the variables
10x+80=0
We move all terms containing x to the left, all other terms to the right
10x=-80
x=-80/10
x=-8
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