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30=-x+3x+6
We move all terms to the left:
30-(-x+3x+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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