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180=(3x)+(2x)+(x)
We move all terms to the left:
180-((3x)+(2x)+(x))=0
We add all the numbers together, and all the variables
-(+6x)+180=0
We get rid of parentheses
-6x+180=0
We move all terms containing x to the left, all other terms to the right
-6x=-180
x=-180/-6
x=+30
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