-21=9*-1-15-3*-1

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Solution for -21=9*-1-15-3*-1 equation: 


Simplifying
-21 = 9 * -1 + -15 + -3 * -1

Multiply 9 * -1
-21 = -9 + -15 + -3 * -1

Multiply -3 * -1
-21 = -9 + -15 + 3

Combine like terms: -9 + -15 = -24
-21 = -24 + 3

Combine like terms: -24 + 3 = -21
-21 = -21

Add '21' to each side of the equation.
-21 + 21 = -21 + 21

Combine like terms: -21 + 21 = 0
0 = -21 + 21

Combine like terms: -21 + 21 = 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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