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-140-2x=70-8x
We move all terms to the left:
-140-2x-(70-8x)=0
We add all the numbers together, and all the variables
-2x-(-8x+70)-140=0
We get rid of parentheses
-2x+8x-70-140=0
We add all the numbers together, and all the variables
6x-210=0
We move all terms containing x to the left, all other terms to the right
6x=210
x=210/6
x=35
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