2(-9-3)+21=-3

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Solution for 2(-9-3)+21=-3 equation: 


Simplifying
2(-9 + -3) + 21 = -3

Combine like terms: -9 + -3 = -12
2(-12) + 21 = -3

Multiply 2 * -12
-24 + 21 = -3

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

Add '3' to each side of the equation.
-3 + 3 = -3 + 3

Combine like terms: -3 + 3 = 0
0 = -3 + 3

Combine like terms: -3 + 3 = 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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