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+ x - = -
- x - = -
+ x + = +
- x - = -
-2(+5)= -10
-3(-10)= 30
5(-6) = -30
Suma y resta de signos
-2 + (-3) = -2 -3= -5
10 -(-5) =10+5= 15
-5 - (-5) = -5 + 5 = 0
-20 + (-5) = -20 - 5 = -25
-15 + (5) = -15 + 5 = -10