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w in (-oo:+oo)
79 = 7*w+4*w+2 // - 7*w+4*w+2
79-(7*w)-(4*w)-2 = 0
79-7*w-4*w-2 = 0
77-11*w = 0 // - 77
-11*w = -77 // : -11
w = -77/(-11)
w = 7
w = 7
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