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12-5(2x-x)=-18
We move all terms to the left:
12-5(2x-x)-(-18)=0
We add all the numbers together, and all the variables
-5(+x)+12-(-18)=0
We add all the numbers together, and all the variables
-5(+x)+30=0
We multiply parentheses
-5x+30=0
We move all terms containing x to the left, all other terms to the right
-5x=-30
x=-30/-5
x=+6
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