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w in (-oo:+oo)
4*(-(7*w)-5) = -104 // + 104
4*(-(7*w)-5)+104 = 0
4*(-7*w-5)+104 = 0
4*(-7*w-5)+104 = 0
84-28*w = 0
84-28*w = 0
84-28*w = 0 // - 84
-28*w = -84 // : -28
w = -84/(-28)
w = 3
w = 3
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