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w in (-oo:+oo)
w-6 = 4*w-42 // - 4*w-42
w-(4*w)-6+42 = 0
w-4*w-6+42 = 0
36-3*w = 0 // - 36
-3*w = -36 // : -3
w = -36/(-3)
w = 12
w = 12
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