(-1)(-1)=

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Solution for (-1)(-1)= equation:


(-1)(-1)=0

We simplify the equation to the form, which is simple to understand 
(-1)*(-1)=0

Reorder the terms in parentheses
multiplication of parentheses
(+1)=0



Remove unnecessary parentheses
+1=0

We move all terms containing  to the left and all other terms to the right. 
0=0-1

We simplify left and right side of the equation. 
0=-1

0=-1

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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