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(6-x)-(7x+9)=21
We move all terms to the left:
(6-x)-(7x+9)-(21)=0
We add all the numbers together, and all the variables
(-1x+6)-(7x+9)-21=0
We get rid of parentheses
-1x-7x+6-9-21=0
We add all the numbers together, and all the variables
-8x-24=0
We move all terms containing x to the left, all other terms to the right
-8x=24
x=24/-8
x=-3
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