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(3x+50)+(130-3x)=180
We move all terms to the left:
(3x+50)+(130-3x)-(180)=0
We add all the numbers together, and all the variables
(3x+50)+(-3x+130)-180=0
We get rid of parentheses
3x-3x+50+130-180=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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