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120=3x-5+x+45+135+x-45+5x=180
We move all terms to the left:
120-(3x-5+x+45+135+x-45+5x)=0
We add all the numbers together, and all the variables
-(10x+130)+120=0
We get rid of parentheses
-10x-130+120=0
We add all the numbers together, and all the variables
-10x-10=0
We move all terms containing x to the left, all other terms to the right
-10x=10
x=10/-10
x=-1
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