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w in (-oo:+oo)
51 = 7*w+5*w+3 // - 7*w+5*w+3
51-(7*w)-(5*w)-3 = 0
51-7*w-5*w-3 = 0
48-12*w = 0 // - 48
-12*w = -48 // : -12
w = -48/(-12)
w = 4
w = 4
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