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3 - (-5) = 3 + 5 ò -8 - (-10 ) = -8 + 10
El ejemplo queda.
-12/5 - (-3/11) =
-12 + 3 = 11x (-12) + 3x(5) - 132 + 15 -127
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5 11 ( 5x11) 55 55
Si queda duda, me dices.