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12-6w+3(2w+3)=2w+5
We move all terms to the left:
12-6w+3(2w+3)-(2w+5)=0
We multiply parentheses
-6w+6w-(2w+5)+9+12=0
We get rid of parentheses
-6w+6w-2w-5+9+12=0
We add all the numbers together, and all the variables
-2w+16=0
We move all terms containing w to the left, all other terms to the right
-2w=-16
w=-16/-2
w=+8
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