21-(-4)=17

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Solution for 21-(-4)=17 equation: 


Simplifying
21 + -1(-4) = 17

Multiply -1 * -4
21 + 4 = 17

Combine like terms: 21 + 4 = 25
25 = 17

Solving
25 = 17

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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