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w in (-oo:+oo)
-4*w-(7*w)-(4/7) = 29/7 // - 29/7
-4*w-(7*w)-(4/7)-(29/7) = 0
-4*w-7*w-4/7-29/7 = 0
-11*w-33/7 = 0 // + 33/7
-11*w = 33/7 // : -11
w = 33/7/(-11)
w = -3/7
w = -3/7
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