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x+(x+30)+(210-3x)=180
We move all terms to the left:
x+(x+30)+(210-3x)-(180)=0
We add all the numbers together, and all the variables
x+(x+30)+(-3x+210)-180=0
We get rid of parentheses
x+x-3x+30+210-180=0
We add all the numbers together, and all the variables
-1x+60=0
We move all terms containing x to the left, all other terms to the right
-x=-60
x=-60/-1
x=+60
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