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(21x+7)+(15x+27)=180
We move all terms to the left:
(21x+7)+(15x+27)-(180)=0
We get rid of parentheses
21x+15x+7+27-180=0
We add all the numbers together, and all the variables
36x-146=0
We move all terms containing x to the left, all other terms to the right
36x=146
x=146/36
x=4+1/18
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