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x+2x+30+90=360*
We move all terms to the left:
x+2x+30+90-(360*)=0
We add all the numbers together, and all the variables
x+2x+30+90-0=0
We add all the numbers together, and all the variables
3x+120=0
We move all terms containing x to the left, all other terms to the right
3x=-120
x=-120/3
x=-40
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