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w in (-oo:+oo)
3/10-4*w = -357/10 // + -357/10
3/10-4*w-(-357/10) = 0
3/10-4*w+357/10 = 0
36-4*w = 0 // - 36
-4*w = -36 // : -4
w = -36/(-4)
w = 9
w = 9
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