Explicación paso a paso:
ELINA EDAD : X
2X+12=56
2X=44
X=22
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Explicación paso a paso:
ELINA EDAD : X
2X+12=56
2X=44
X=22
X=22
2x + 24 = 56
2x = 32
x=32/2
x=16
2x + 12 = 56
2x = 56 - 12
2x = 44
x = 44/2
x = 22