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w in (-oo:+oo)
w/(-4.2) = 10.3 // - 10.3
w/(-4.2)-10.3 = 0
-0.23809524*w-10.3 = 0 // + 10.3
-0.23809524*w = 10.3 // : -0.23809524
w = 10.3/(-0.23809524)
w = -43.25999965
w = -43.25999965
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