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6-3(2a-4)=-18
We move all terms to the left:
6-3(2a-4)-(-18)=0
We add all the numbers together, and all the variables
-3(2a-4)+24=0
We multiply parentheses
-6a+12+24=0
We add all the numbers together, and all the variables
-6a+36=0
We move all terms containing a to the left, all other terms to the right
-6a=-36
a=-36/-6
a=+6
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