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(13x+45)+(6x+2)=180
We move all terms to the left:
(13x+45)+(6x+2)-(180)=0
We get rid of parentheses
13x+6x+45+2-180=0
We add all the numbers together, and all the variables
19x-133=0
We move all terms containing x to the left, all other terms to the right
19x=133
x=133/19
x=7
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