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-30=x+2x+-6
We move all terms to the left:
-30-(x+2x+-6)=0
We add all the numbers together, and all the variables
-(3x-6)-30=0
We get rid of parentheses
-3x+6-30=0
We add all the numbers together, and all the variables
-3x-24=0
We move all terms containing x to the left, all other terms to the right
-3x=24
x=24/-3
x=-8
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