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(-9-6x)=x-30
We move all terms to the left:
(-9-6x)-(x-30)=0
We add all the numbers together, and all the variables
(-6x-9)-(x-30)=0
We get rid of parentheses
-6x-x-9+30=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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