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a/7 = b/9 = c/11 = d/13 = x
Entonces:
7x= a
9x= b
11x= c
13x= d
a-b+c=36
7x - 9x + 11x= 36
9x= 36
x= 36/9
x= 4
Es decir:
13x=d = 13*4 = 52
R: d) 52.