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2(R^2-3R+2R-6)=28
2(R^2-R-6)=28
2R^2-2R-12=28
2R^2-2R-12-28=0
2R^2-2R-40=0
R^2-R-20=0 R1=5 y R=-4
tomamos el positivo R=5
rpta 5 años tiene Rocio
2x = 28 -2 + 3
2x = 29
x = 29/2
x = 14.5