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-x-7=x+9x=
We move all terms to the left:
-x-7-(x+9x)=0
We add all the numbers together, and all the variables
-x-(+10x)-7=0
We add all the numbers together, and all the variables
-1x-(+10x)-7=0
We get rid of parentheses
-1x-10x-7=0
We add all the numbers together, and all the variables
-11x-7=0
We move all terms containing x to the left, all other terms to the right
-11x=7
x=7/-11
x=-7/11
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