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sonia - 8 = 4(elena - 8) -----> sonia = 8 + 4elena - 32 ----->
sonia = 4elena - 24
del otro dato:
sonia + 12 = 2(elena + 12) -----> sonia + 12 = 2elena + 24
resolviendo las ecuaciones tendremos:
4elena - 24 + 12 = 2elena + 24
4elena - 2elena = 24 + 24 - 12
2elena = 36
elena = 18 años, RESPUESTA A