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-7+2=2x+9x
We move all terms to the left:
-7+2-(2x+9x)=0
We add all the numbers together, and all the variables
-(+11x)-7+2=0
We add all the numbers together, and all the variables
-(+11x)-5=0
We get rid of parentheses
-11x-5=0
We move all terms containing x to the left, all other terms to the right
-11x=5
x=5/-11
x=-5/11
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