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80=2.5x+100
We move all terms to the left:
80-(2.5x+100)=0
We get rid of parentheses
-2.5x-100+80=0
We add all the numbers together, and all the variables
-2.5x-20=0
We move all terms containing x to the left, all other terms to the right
-2.5x=20
x=20/-2.5
x=-8
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