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(5x+4)+(5x+4)=180
We move all terms to the left:
(5x+4)+(5x+4)-(180)=0
We get rid of parentheses
5x+5x+4+4-180=0
We add all the numbers together, and all the variables
10x-172=0
We move all terms containing x to the left, all other terms to the right
10x=172
x=172/10
x=17+1/5
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