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M⇒marlon
J-14=M (1)
M+J=56 (2)
Despejamos M en la ecuación (2)
M=56-J
Igualamos
56-J=J-14
Resolvemos
56+14=J+J
70=2J
70/2=J
35=J
M=56-J
M=56-35
M=21
Espero te ayude :)
J= x+14
suman total 56
x+x+14=56
2x+14=56
2x=42
x=21
en conclusion marlon tendra 21 años y
Juan tendra 35 años