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w in (-oo:+oo)
-60 = (-2/3)*w // - (-2/3)*w
-((-2/3)*w)-60 = 0
(2/3)*w-60 = 0
2/3*w-60 = 0 // + 60
2/3*w = 60 // : 2/3
w = 60/2/3
w = 90
w = 90
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