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(6-9x)/21+(7x-7)/21=9x/21
We move all terms to the left:
(6-9x)/21+(7x-7)/21-(9x/21)=0
We add all the numbers together, and all the variables
(-9x+6)/21+(7x-7)/21-(+9x/21)=0
We get rid of parentheses
(-9x+6)/21+(7x-7)/21-9x/21=0
We multiply all the terms by the denominator
(-9x+6)+(7x-7)-9x=0
We add all the numbers together, and all the variables
-9x+(-9x+6)+(7x-7)=0
We get rid of parentheses
-9x-9x+7x+6-7=0
We add all the numbers together, and all the variables
-11x-1=0
We move all terms containing x to the left, all other terms to the right
-11x=1
x=1/-11
x=-1/11
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