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(5x+10)+(6x-21)=180
We move all terms to the left:
(5x+10)+(6x-21)-(180)=0
We get rid of parentheses
5x+6x+10-21-180=0
We add all the numbers together, and all the variables
11x-191=0
We move all terms containing x to the left, all other terms to the right
11x=191
x=191/11
x=17+4/11
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