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w in (-oo:+oo)
-15/4 = -5*w // + -5*w
-(-5*w)-15/4 = 0
5*w-15/4 = 0
5*w-15/4 = 0 // + 15/4
5*w = 15/4 // : 5
w = 15/4/5
w = 3/4
w = 3/4
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