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80+x+2x+70=360.
We move all terms to the left:
80+x+2x+70-(360.)=0
We add all the numbers together, and all the variables
x+2x+80+70-360=0
We add all the numbers together, and all the variables
3x-210=0
We move all terms containing x to the left, all other terms to the right
3x=210
x=210/3
x=70
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