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90+(15x+30)+10x=180
We move all terms to the left:
90+(15x+30)+10x-(180)=0
We add all the numbers together, and all the variables
10x+(15x+30)-90=0
We get rid of parentheses
10x+15x+30-90=0
We add all the numbers together, and all the variables
25x-60=0
We move all terms containing x to the left, all other terms to the right
25x=60
x=60/25
x=2+2/5
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