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Hola !! ^^=> Resolviendo ;
a/7 =16/b = c/3
ademas : ac =84 .... a=84/c
a/7 = c/3
a= 7c/3
=> Igualamos las "a" :
7c/3 = 84/c
7c^2 = 84*3
c^2 = 84*3/7
c^2 = 12*3
c^2 = 36
c= 6
=> Calculamos "a" :
a= 84/c
a= 84/6
a= 14
=> Calculamos "b" :
a/7= 16/b
14/7 =16/b
b= 16/2
b= 8
Respuesta : 8
Espero te sirva !! ^^