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180=3x+3x+x
We move all terms to the left:
180-(3x+3x+x)=0
We add all the numbers together, and all the variables
-(+7x)+180=0
We get rid of parentheses
-7x+180=0
We move all terms containing x to the left, all other terms to the right
-7x=-180
x=-180/-7
x=25+5/7
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