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(3x+10)+(5x-30)=180
We move all terms to the left:
(3x+10)+(5x-30)-(180)=0
We get rid of parentheses
3x+5x+10-30-180=0
We add all the numbers together, and all the variables
8x-200=0
We move all terms containing x to the left, all other terms to the right
8x=200
x=200/8
x=25
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