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d in (-oo:+oo)
(1/4)*(5*d+11) = 19 // - 19
(1/4)*(5*d+11)-19 = 0
1/4*(5*d+11)-19 = 0
1/4*(5*d+11)-19 = 0
5/4*d-65/4 = 0
5/4*d-65/4 = 0
5/4*d-65/4 = 0 // + 65/4
5/4*d = 65/4 // : 5/4
d = 65/4/5/4
d = 13
d = 13
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