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w in (-oo:+oo)
14-(w/8) = (3*w)/4-21 // - (3*w)/4-21
14-(w/8)-((3*w)/4)+21 = 0
(-3/4)*w-(w/8)+14+21 = 0
35-7/8*w = 0 // - 35
-7/8*w = -35 // : -7/8
w = -35/(-7/8)
w = 40
w = 40
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