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(3x-17)+(5x-21)=180
We move all terms to the left:
(3x-17)+(5x-21)-(180)=0
We get rid of parentheses
3x+5x-17-21-180=0
We add all the numbers together, and all the variables
8x-218=0
We move all terms containing x to the left, all other terms to the right
8x=218
x=218/8
x=27+1/4
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