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w in (-oo:+oo)
-10/(-6.9) = -6.9*w // + -6.9*w
-(-6.9*w)-10/(-6.9) = 0
6.9*w-10/(-6.9) = 0
6.9*w+1.44927536 = 0 // - 1.44927536
6.9*w = -1.44927536 // : 6.9
w = -1.44927536/6.9
w = -0.21003991
w = -0.21003991
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