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w in (-oo:+oo)
1/2-3*w = -71/2 // + -71/2
1/2-3*w-(-71/2) = 0
1/2-3*w+71/2 = 0
36-3*w = 0 // - 36
-3*w = -36 // : -3
w = -36/(-3)
w = 12
w = 12
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