9-(-4)=28

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Solution for 9-(-4)=28 equation: 


Simplifying
9 + -1(-4) = 28

Multiply -1 * -4
9 + 4 = 28

Combine like terms: 9 + 4 = 13
13 = 28

Solving
13 = 28

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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