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(3x+15)+90=180
We move all terms to the left:
(3x+15)+90-(180)=0
We add all the numbers together, and all the variables
(3x+15)-90=0
We get rid of parentheses
3x+15-90=0
We add all the numbers together, and all the variables
3x-75=0
We move all terms containing x to the left, all other terms to the right
3x=75
x=75/3
x=25
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