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w in (-oo:+oo)
5-(4*w) = 3*w-72 // - 3*w-72
5-(4*w)-(3*w)+72 = 0
5-4*w-3*w+72 = 0
77-7*w = 0 // - 77
-7*w = -77 // : -7
w = -77/(-7)
w = 11
w = 11
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