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y in (-oo:+oo)
(21/4)*y = 1/4-8 // - 1/4-8
(21/4)*y-(1/4)+8 = 0
(21/4)*y-1/4+8 = 0
21/4*y+31/4 = 0 // - 31/4
21/4*y = -31/4 // : 21/4
y = -31/4/21/4
y = -31/21
y = -31/21
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