21-1*2+5-9=15

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Solution for 21-1*2+5-9=15 equation: 


Simplifying
21 + -1 * 2 + 5 + -9 = 15

Multiply -1 * 2
21 + -2 + 5 + -9 = 15

Combine like terms: 21 + -2 = 19
19 + 5 + -9 = 15

Combine like terms: 19 + 5 = 24
24 + -9 = 15

Combine like terms: 24 + -9 = 15
15 = 15

Add '-15' to each side of the equation.
15 + -15 = 15 + -15

Combine like terms: 15 + -15 = 0
0 = 15 + -15

Combine like terms: 15 + -15 = 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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