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x + 1 = 2x - 3
2x - x = 3 + 1
x = 4
El numero es 4
b)
a + b = 48
3b = a
3b + b = 48
4b = 48
b = 12
a = 3b
a = 3(12)
a = 36
Uno tiene 36 y otro tiene 12
c)
y + 5 = 2y - 20
2y - y = 20 + 5
y = 25
La edad del profesor es de 25