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(2x+4)+5x+15)=180
We move all terms to the left:
(2x+4)+5x+15)-(180)=0
We add all the numbers together, and all the variables
5x+(2x+4)=0
We get rid of parentheses
5x+2x+4=0
We add all the numbers together, and all the variables
7x+4=0
We move all terms containing x to the left, all other terms to the right
7x=-4
x=-4/7
x=-4/7
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