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(10x-15)+(3x)=180
We move all terms to the left:
(10x-15)+(3x)-(180)=0
We add all the numbers together, and all the variables
3x+(10x-15)-180=0
We get rid of parentheses
3x+10x-15-180=0
We add all the numbers together, and all the variables
13x-195=0
We move all terms containing x to the left, all other terms to the right
13x=195
x=195/13
x=15
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