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100=5x+180
We move all terms to the left:
100-(5x+180)=0
We get rid of parentheses
-5x-180+100=0
We add all the numbers together, and all the variables
-5x-80=0
We move all terms containing x to the left, all other terms to the right
-5x=80
x=80/-5
x=-16
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