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w+90=3w-54
We move all terms to the left:
w+90-(3w-54)=0
We get rid of parentheses
w-3w+54+90=0
We add all the numbers together, and all the variables
-2w+144=0
We move all terms containing w to the left, all other terms to the right
-2w=-144
w=-144/-2
w=+72
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