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15=2x+(10-9)
We move all terms to the left:
15-(2x+(10-9))=0
We add all the numbers together, and all the variables
-(2x+1)+15=0
We get rid of parentheses
-2x-1+15=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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