9+1=4-9

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Solution for 9+1=4-9 equation: 


Simplifying
9 + 1 = 4 + -9

Combine like terms: 9 + 1 = 10
10 = 4 + -9

Combine like terms: 4 + -9 = -5
10 = -5

Solving
10 = -5

Couldn't find a variable to solve for.

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

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