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y in (-oo:+oo)
(21/2)*y-((1/4)*y) = 11 // - 11
(21/2)*y-((1/4)*y)-11 = 0
(21/2)*y+(-1/4)*y-11 = 0
41/4*y-11 = 0 // + 11
41/4*y = 11 // : 41/4
y = 11/41/4
y = 44/41
y = 44/41
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