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y in (-oo:+oo)
14-((1/8)*y) = (3/4)*y-21 // - (3/4)*y-21
14-((1/8)*y)-((3/4)*y)+21 = 0
(-1/8)*y+(-3/4)*y+14+21 = 0
35-7/8*y = 0 // - 35
-7/8*y = -35 // : -7/8
y = -35/(-7/8)
y = 40
y = 40
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