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5x-40=140+2x
We move all terms to the left:
5x-40-(140+2x)=0
We add all the numbers together, and all the variables
5x-(2x+140)-40=0
We get rid of parentheses
5x-2x-140-40=0
We add all the numbers together, and all the variables
3x-180=0
We move all terms containing x to the left, all other terms to the right
3x=180
x=180/3
x=60
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