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X+9= Edad de Maria.
X+(X+9) = 73
X+X+9 = 73
X+X = 73-9
2X = 64
X = 64/2
X = 32
X= 32
X+9 = 32+9 = 41
Juan tiene 32 años y Maria tiene 41.
Juan = s
s + 9 + s = 73
2s + 9 = 73
2s = 73 - 9
2s = 64
s = 64/2
s = 32
s + 9 =
32 + 9 =
41
María tiene 41 años
Juan tiene 32 años