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1-/2-1/5=1/2-x
x=1/2-1/2+1/5 --------> 1/2 y -1/2 (se eliminan)
x= 1/5
b) 1/2 :1/6 ∷x : 2/3
1/2(6) = x(3/2)
6/2 = x(3/2)
3 = x(3/2)
x = 3(2/3)
x = 6/3
x = 2