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(6x-21)+105=180
We move all terms to the left:
(6x-21)+105-(180)=0
We add all the numbers together, and all the variables
(6x-21)-75=0
We get rid of parentheses
6x-21-75=0
We add all the numbers together, and all the variables
6x-96=0
We move all terms containing x to the left, all other terms to the right
6x=96
x=96/6
x=16
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