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40+80=180-15x
We move all terms to the left:
40+80-(180-15x)=0
We add all the numbers together, and all the variables
-(-15x+180)+40+80=0
We add all the numbers together, and all the variables
-(-15x+180)+120=0
We get rid of parentheses
15x-180+120=0
We add all the numbers together, and all the variables
15x-60=0
We move all terms containing x to the left, all other terms to the right
15x=60
x=60/15
x=4
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