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(2x-15)+x+90=180
We move all terms to the left:
(2x-15)+x+90-(180)=0
We add all the numbers together, and all the variables
x+(2x-15)-90=0
We get rid of parentheses
x+2x-15-90=0
We add all the numbers together, and all the variables
3x-105=0
We move all terms containing x to the left, all other terms to the right
3x=105
x=105/3
x=35
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