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13-18=7w+12
We move all terms to the left:
13-18-(7w+12)=0
We add all the numbers together, and all the variables
-(7w+12)-5=0
We get rid of parentheses
-7w-12-5=0
We add all the numbers together, and all the variables
-7w-17=0
We move all terms containing w to the left, all other terms to the right
-7w=17
w=17/-7
w=-2+3/7
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