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w in (-oo:+oo)
4*w-(3/10) = 717/10-4*w // - 717/10-4*w
4*w-(-4*w)-(3/10)-(717/10) = 0
4*w+4*w-3/10-717/10 = 0
8*w-72 = 0 // + 72
8*w = 72 // : 8
w = 72/8
w = 9
w = 9
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