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2x-140=40-8x
We move all terms to the left:
2x-140-(40-8x)=0
We add all the numbers together, and all the variables
2x-(-8x+40)-140=0
We get rid of parentheses
2x+8x-40-140=0
We add all the numbers together, and all the variables
10x-180=0
We move all terms containing x to the left, all other terms to the right
10x=180
x=180/10
x=18
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