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-12.4=w/7-1.2
We move all terms to the left:
-12.4-(w/7-1.2)=0
We get rid of parentheses
-w/7+1.2-12.4=0
We multiply all the terms by the denominator
-w+(1.2)*7-(12.4)*7=0
We add all the numbers together, and all the variables
-1w-78.4=0
We move all terms containing w to the left, all other terms to the right
-w=78.4
w=78.4/-1
w=-78+0.40000000000001/1
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