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a+b = 51
a= 51-b
Ahora resolver !
a/3-b/6 = 1
51-b/3 - b/6 = 1
2×(51-b) -b = 6
102 - 2b - b = 6
102 - 3b = 6
96 = 3b
96/3 = b
32 = b
Entonces b= 32, Ahora hallamos "a"
a+b = 51
a+32 = 51
a = 19
Salu2