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a). 3x+5=26.
3x = 26 -5
3x = 21
x = 21/3
x = 7
El quintuplo de un numero, disminuido en 4 es igual a 21.
b). 5x-4=21
5x = 21 + 4
5x = 25
x = 25/5
x = 5