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w in (-oo:+oo)
4*(6-(7*w)) = -60 // + 60
4*(6-(7*w))+60 = 0
4*(6-7*w)+60 = 0
4*(6-7*w)+60 = 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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