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2x+6x-140+3x-10+x+30=360
We move all terms to the left:
2x+6x-140+3x-10+x+30-(360)=0
We add all the numbers together, and all the variables
12x-480=0
We move all terms containing x to the left, all other terms to the right
12x=480
x=480/12
x=40
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