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(4x-9)+(6x-9)+x=180
We move all terms to the left:
(4x-9)+(6x-9)+x-(180)=0
We add all the numbers together, and all the variables
x+(4x-9)+(6x-9)-180=0
We get rid of parentheses
x+4x+6x-9-9-180=0
We add all the numbers together, and all the variables
11x-198=0
We move all terms containing x to the left, all other terms to the right
11x=198
x=198/11
x=18
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