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(3a-15)=180
We move all terms to the left:
(3a-15)-(180)=0
We get rid of parentheses
3a-15-180=0
We add all the numbers together, and all the variables
3a-195=0
We move all terms containing a to the left, all other terms to the right
3a=195
a=195/3
a=65
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