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(5x-15)+90+(2x)=180
We move all terms to the left:
(5x-15)+90+(2x)-(180)=0
We add all the numbers together, and all the variables
2x+(5x-15)-90=0
We get rid of parentheses
2x+5x-15-90=0
We add all the numbers together, and all the variables
7x-105=0
We move all terms containing x to the left, all other terms to the right
7x=105
x=105/7
x=15
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