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-2(9+x)=-30
We move all terms to the left:
-2(9+x)-(-30)=0
We add all the numbers together, and all the variables
-2(x+9)-(-30)=0
We add all the numbers together, and all the variables
-2(x+9)+30=0
We multiply parentheses
-2x-18+30=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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