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x-(2x-180)=-210
We move all terms to the left:
x-(2x-180)-(-210)=0
We add all the numbers together, and all the variables
x-(2x-180)+210=0
We get rid of parentheses
x-2x+180+210=0
We add all the numbers together, and all the variables
-1x+390=0
We move all terms containing x to the left, all other terms to the right
-x=-390
x=-390/-1
x=+390
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