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6(180-x)=90-x
We move all terms to the left:
6(180-x)-(90-x)=0
We add all the numbers together, and all the variables
6(-1x+180)-(-1x+90)=0
We multiply parentheses
-6x-(-1x+90)+1080=0
We get rid of parentheses
-6x+1x-90+1080=0
We add all the numbers together, and all the variables
-5x+990=0
We move all terms containing x to the left, all other terms to the right
-5x=-990
x=-990/-5
x=+198
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