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180=12x+30
We move all terms to the left:
180-(12x+30)=0
We get rid of parentheses
-12x-30+180=0
We add all the numbers together, and all the variables
-12x+150=0
We move all terms containing x to the left, all other terms to the right
-12x=-150
x=-150/-12
x=12+1/2
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