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70.2=w+31.2
We move all terms to the left:
70.2-(w+31.2)=0
We get rid of parentheses
-w-31.2+70.2=0
We add all the numbers together, and all the variables
-1w+39=0
We move all terms containing w to the left, all other terms to the right
-w=-39
w=-39/-1
w=+39
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