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-99=6+7x
We move all terms to the left:
-99-(6+7x)=0
We add all the numbers together, and all the variables
-(7x+6)-99=0
We get rid of parentheses
-7x-6-99=0
We add all the numbers together, and all the variables
-7x-105=0
We move all terms containing x to the left, all other terms to the right
-7x=105
x=105/-7
x=-15
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