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(9x-10)+(4x-5)=180
We move all terms to the left:
(9x-10)+(4x-5)-(180)=0
We get rid of parentheses
9x+4x-10-5-180=0
We add all the numbers together, and all the variables
13x-195=0
We move all terms containing x to the left, all other terms to the right
13x=195
x=195/13
x=15
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