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(2x+5)+(5x-20)=180
We move all terms to the left:
(2x+5)+(5x-20)-(180)=0
We get rid of parentheses
2x+5x+5-20-180=0
We add all the numbers together, and all the variables
7x-195=0
We move all terms containing x to the left, all other terms to the right
7x=195
x=195/7
x=27+6/7
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