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157=70-w
We move all terms to the left:
157-(70-w)=0
We add all the numbers together, and all the variables
-(-1w+70)+157=0
We get rid of parentheses
1w-70+157=0
We add all the numbers together, and all the variables
w+87=0
We move all terms containing w to the left, all other terms to the right
w=-87
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