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180=15x-30
We move all terms to the left:
180-(15x-30)=0
We get rid of parentheses
-15x+30+180=0
We add all the numbers together, and all the variables
-15x+210=0
We move all terms containing x to the left, all other terms to the right
-15x=-210
x=-210/-15
x=+14
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