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El triple = 3x
Resolvemos :
x + 20 = 3x - 8
x - 3x = - 8 - 20
- 2x = - 28
x = -28/-2
x = 14
Solución : El número es 14
COMPROBAMOS :
x + 20 = 3x - 8
14 + 20 = 3 (14) - 8
34 = 42 - 8
34 = 34
La solución es correcta.
x + 20 = 3(x - 8)
x+20 = 3x -24
20+24 = 3x - x
44 = 2x
44/2 = x
22 = x