-8*-7+9*-7-21=-12-16

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Solution for -8*-7+9*-7-21=-12-16 equation: 


Simplifying
-8 * -7 + 9 * -7 + -21 = -12 + -16

Multiply -8 * -7
56 + 9 * -7 + -21 = -12 + -16

Multiply 9 * -7
56 + -63 + -21 = -12 + -16

Combine like terms: 56 + -63 = -7
-7 + -21 = -12 + -16

Combine like terms: -7 + -21 = -28
-28 = -12 + -16

Combine like terms: -12 + -16 = -28
-28 = -28

Add '28' to each side of the equation.
-28 + 28 = -28 + 28

Combine like terms: -28 + 28 = 0
0 = -28 + 28

Combine like terms: -28 + 28 = 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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