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(4x-5)+(5x-15)=180
We move all terms to the left:
(4x-5)+(5x-15)-(180)=0
We get rid of parentheses
4x+5x-5-15-180=0
We add all the numbers together, and all the variables
9x-200=0
We move all terms containing x to the left, all other terms to the right
9x=200
x=200/9
x=22+2/9
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