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w in (-oo:+oo)
14-((1/8)*w) = (3/4)*w-21 // - (3/4)*w-21
14-((1/8)*w)-((3/4)*w)+21 = 0
(-1/8)*w+(-3/4)*w+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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