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w in (-oo:+oo)
-15 = -w/3 // + -w/3
-(-w/3)-15 = 0
(1/3)*w-15 = 0
1/3*w-15 = 0 // + 15
1/3*w = 15 // : 1/3
w = 15/1/3
w = 45
w = 45
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