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w=2.5*4.2+1.2*6.5
We move all terms to the left:
w-(2.5*4.2+1.2*6.5)=0
We add all the numbers together, and all the variables
w-(18.3)=0
We add all the numbers together, and all the variables
w-18.3=0
We move all terms containing w to the left, all other terms to the right
w=18.3
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