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(5x+6)+(4x-15)=180
We move all terms to the left:
(5x+6)+(4x-15)-(180)=0
We get rid of parentheses
5x+4x+6-15-180=0
We add all the numbers together, and all the variables
9x-189=0
We move all terms containing x to the left, all other terms to the right
9x=189
x=189/9
x=21
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