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1.3w+1.2w-2.1=5.4
We move all terms to the left:
1.3w+1.2w-2.1-(5.4)=0
We add all the numbers together, and all the variables
2.5w-7.5=0
We move all terms containing w to the left, all other terms to the right
2.5w=7.5
w=7.5/2.5
w=3
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