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(108-x)+(90-x)=210
We move all terms to the left:
(108-x)+(90-x)-(210)=0
We add all the numbers together, and all the variables
(-1x+108)+(-1x+90)-210=0
We get rid of parentheses
-1x-1x+108+90-210=0
We add all the numbers together, and all the variables
-2x-12=0
We move all terms containing x to the left, all other terms to the right
-2x=12
x=12/-2
x=-6
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