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(13x-21)+(5x+75)=180
We move all terms to the left:
(13x-21)+(5x+75)-(180)=0
We get rid of parentheses
13x+5x-21+75-180=0
We add all the numbers together, and all the variables
18x-126=0
We move all terms containing x to the left, all other terms to the right
18x=126
x=126/18
x=7
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