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6=-2(15-x)
We move all terms to the left:
6-(-2(15-x))=0
We add all the numbers together, and all the variables
-(-2(-1x+15))+6=0
We calculate terms in parentheses: -(-2(-1x+15)), so:We get rid of parentheses
-2(-1x+15)
We multiply parentheses
2x-30
Back to the equation:
-(2x-30)
-2x+30+6=0
We add all the numbers together, and all the variables
-2x+36=0
We move all terms containing x to the left, all other terms to the right
-2x=-36
x=-36/-2
x=+18
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