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(12x-14)+(9x+20)+90=180
We move all terms to the left:
(12x-14)+(9x+20)+90-(180)=0
We add all the numbers together, and all the variables
(12x-14)+(9x+20)-90=0
We get rid of parentheses
12x+9x-14+20-90=0
We add all the numbers together, and all the variables
21x-84=0
We move all terms containing x to the left, all other terms to the right
21x=84
x=84/21
x=4
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