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w in (-oo:+oo)
1/2-5*w = -29/2 // + -29/2
1/2-5*w-(-29/2) = 0
1/2-5*w+29/2 = 0
15-5*w = 0 // - 15
-5*w = -15 // : -5
w = -15/(-5)
w = 3
w = 3
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