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(9x+4)+(12x-14)=180
We move all terms to the left:
(9x+4)+(12x-14)-(180)=0
We get rid of parentheses
9x+12x+4-14-180=0
We add all the numbers together, and all the variables
21x-190=0
We move all terms containing x to the left, all other terms to the right
21x=190
x=190/21
x=9+1/21
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