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(40-3x)+4x=180
We move all terms to the left:
(40-3x)+4x-(180)=0
We add all the numbers together, and all the variables
(-3x+40)+4x-180=0
We add all the numbers together, and all the variables
4x+(-3x+40)-180=0
We get rid of parentheses
4x-3x+40-180=0
We add all the numbers together, and all the variables
x-140=0
We move all terms containing x to the left, all other terms to the right
x=140
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