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w in (-oo:+oo)
(-9/13)*w = 3/10 // - 3/10
(-9/13)*w-(3/10) = 0
(-9/13)*w-3/10 = 0
-9/13*w-3/10 = 0 // + 3/10
-9/13*w = 3/10 // : -9/13
w = 3/10/(-9/13)
w = -13/30
w = -13/30
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