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-30=-x-x-6
We move all terms to the left:
-30-(-x-x-6)=0
We add all the numbers together, and all the variables
-(-2x-6)-30=0
We get rid of parentheses
2x+6-30=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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