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w in (-oo:+oo)
w-4 = 4*w-37 // - 4*w-37
w-(4*w)-4+37 = 0
w-4*w-4+37 = 0
33-3*w = 0 // - 33
-3*w = -33 // : -3
w = -33/(-3)
w = 11
w = 11
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