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w in (-oo:+oo)
14-(w/8) = 3*w-21 // - 3*w-21
14-(w/8)-(3*w)+21 = 0
14-(w/8)-3*w+21 = 0
35-25/8*w = 0 // - 35
-25/8*w = -35 // : -25/8
w = -35/(-25/8)
w = 56/5
w = 56/5
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