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2(-3w+10)=4w-20
We move all terms to the left:
2(-3w+10)-(4w-20)=0
We multiply parentheses
-6w-(4w-20)+20=0
We get rid of parentheses
-6w-4w+20+20=0
We add all the numbers together, and all the variables
-10w+40=0
We move all terms containing w to the left, all other terms to the right
-10w=-40
w=-40/-10
w=+4
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