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(aquí note que d > 13)
2) 4D = c'(2d) +16 ===== 2D = c'd + 8
3) 2cd + 26 = c'd + 8
(2c - c') d = -18
(c' - 2c) d = 18
como d > 13, (c'-2c) y d son enteros, entonces d = 18