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(140+2x+4)=180
We move all terms to the left:
(140+2x+4)-(180)=0
We add all the numbers together, and all the variables
(2x+144)-180=0
We get rid of parentheses
2x+144-180=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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