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w in (-oo:+oo)
1-5*w = 5*w-19 // - 5*w-19
1-5*w-(5*w)+19 = 0
1-5*w-5*w+19 = 0
20-10*w = 0 // - 20
-10*w = -20 // : -10
w = -20/(-10)
w = 2
w = 2
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