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(x - 1)/5 = c + 5
(x - 1)/5 - 5= c
igualamos
(x - 2)/7 = (x - 1)/5 - 5
(x - 2) = 7(x - 1)/5 - 35
(x - 2) + 35 = 7(x - 1)/5
5(x - 2) + 175 = 7x - 7
5x - 10 + 175 + 7 = 7x
2x = 172
x = 86
al dividir 86/7 el cociente es 12, el residuo es 2
al dividir 86/5 el cociente es 17, el residuo es 1
Espero te sirva :)