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Cuánto se necesita sumarle para obtener 89/40
8/5 + x = 89/40
x = 89/40 - 8/5
x = (89 - 64)/40
x = 25/40
x = 5/8
5 cajas de chocolate más 3 sueltos es 38:
5y + 3 = 38
5y = 35
y = 7
El cuádruple de un número es 17:
4z = 17
z = 17/4
z = 4,25