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w in (-oo:+oo)
(-1/3)*w+7/10 = 37/10 // - 37/10
(-1/3)*w+7/10-(37/10) = 0
(-1/3)*w+7/10-37/10 = 0
-1/3*w-3 = 0 // + 3
-1/3*w = 3 // : -1/3
w = 3/(-1/3)
w = -9
w = -9
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