10-9=2-1

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Solution for 10-9=2-1 equation: 


Simplifying
10 + -9 = 2 + -1

Combine like terms: 10 + -9 = 1
1 = 2 + -1

Combine like terms: 2 + -1 = 1
1 = 1

Add '-1' to each side of the equation.
1 + -1 = 1 + -1

Combine like terms: 1 + -1 = 0
0 = 1 + -1

Combine like terms: 1 + -1 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

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

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