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16=7-w.w=
We move all terms to the left:
16-(7-w.w)=0
We add all the numbers together, and all the variables
-(-w.w+7)+16=0
We get rid of parentheses
w.w-7+16=0
We add all the numbers together, and all the variables
w.w+9=0
We move all terms containing w to the left, all other terms to the right
w.w=-9
w=-9/1
w=-9
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