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w in (-oo:+oo)
73 = 6*w+w+10 // - 6*w+w+10
73-(6*w)-w-10 = 0
73-6*w-w-10 = 0
63-7*w = 0 // - 63
-7*w = -63 // : -7
w = -63/(-7)
w = 9
w = 9
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