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(4+5x)+(2+x)=180
We move all terms to the left:
(4+5x)+(2+x)-(180)=0
We add all the numbers together, and all the variables
(5x+4)+(x+2)-180=0
We get rid of parentheses
5x+x+4+2-180=0
We add all the numbers together, and all the variables
6x-174=0
We move all terms containing x to the left, all other terms to the right
6x=174
x=174/6
x=29
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