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(3x-20)+(2x-10)=180
We move all terms to the left:
(3x-20)+(2x-10)-(180)=0
We get rid of parentheses
3x+2x-20-10-180=0
We add all the numbers together, and all the variables
5x-210=0
We move all terms containing x to the left, all other terms to the right
5x=210
x=210/5
x=42
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