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43=12w+7
We move all terms to the left:
43-(12w+7)=0
We get rid of parentheses
-12w-7+43=0
We add all the numbers together, and all the variables
-12w+36=0
We move all terms containing w to the left, all other terms to the right
-12w=-36
w=-36/-12
w=+3
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