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w in (-oo:+oo)
12-((1/8)*w) = (3/4)*w-21 // - (3/4)*w-21
12-((1/8)*w)-((3/4)*w)+21 = 0
(-1/8)*w+(-3/4)*w+12+21 = 0
33-7/8*w = 0 // - 33
-7/8*w = -33 // : -7/8
w = -33/(-7/8)
w = 264/7
w = 264/7
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