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w/2.1+18=-12
We move all terms to the left:
w/2.1+18-(-12)=0
We add all the numbers together, and all the variables
w/2.1+30=0
We multiply all the terms by the denominator
w+30*2.1=0
We add all the numbers together, and all the variables
w+63=0
We move all terms containing w to the left, all other terms to the right
w=-63
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