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-2x-15=x+6x=
We move all terms to the left:
-2x-15-(x+6x)=0
We add all the numbers together, and all the variables
-2x-(+7x)-15=0
We get rid of parentheses
-2x-7x-15=0
We add all the numbers together, and all the variables
-9x-15=0
We move all terms containing x to the left, all other terms to the right
-9x=15
x=15/-9
x=-1+2/3
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