(7+9+10)/3 = (promedio) =26/3
"x" 4° examen--------=) aparte ------=) (7+9+10+x)/4 = 9
=) 26+x=36 ----------=) x= 10
listo :v
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(7+9+10)/3 = (promedio) =26/3
"x" 4° examen--------=) aparte ------=) (7+9+10+x)/4 = 9
=) 26+x=36 ----------=) x= 10
listo :v