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(15+5x)+45+45=180
We move all terms to the left:
(15+5x)+45+45-(180)=0
We add all the numbers together, and all the variables
(5x+15)+45+45-180=0
We add all the numbers together, and all the variables
(5x+15)-90=0
We get rid of parentheses
5x+15-90=0
We add all the numbers together, and all the variables
5x-75=0
We move all terms containing x to the left, all other terms to the right
5x=75
x=75/5
x=15
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