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w in (-oo:+oo)
7.5 = w/3 // - w/3
7.5-(w/3) = 0
7.5-1/3*w = 0 // - 7.5
-1/3*w = -7.5 // : -1/3
w = -7.5/(-1/3)
w = 22.50000023
w = 22.50000023
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