12-13=-1

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Solution for 12-13=-1 equation:


12-13=-1

We simplify the equation to the form, which is simple to understand 
12-13=-1

We move all terms containing  to the left and all other terms to the right. 
0=-1-12+13

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

0=0

This equation is an identity, so all real numbers are solutions.

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