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(7x-21)+(9x+1)=180
We move all terms to the left:
(7x-21)+(9x+1)-(180)=0
We get rid of parentheses
7x+9x-21+1-180=0
We add all the numbers together, and all the variables
16x-200=0
We move all terms containing x to the left, all other terms to the right
16x=200
x=200/16
x=12+1/2
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