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1/2 a - 1/4 b = 1/3 a + 1/6 b
1)Sacamos el minimo comun multiplo de los denominadores
m.c.m (2.4.3.6)= 12
2) Hacemos la multiplicamos el M.C.M con numeradores
12*1/2 a -12*1/4 b = 12*1/3 a +12*1/6 b
3) Ahora simplificamos
12/2 a -12/4 b = 12/3 a +12/6 b
6a-3b = 4a + 2b
6a-4a = 2b +3b
2a = 5b
2a - 5b = 0