13(-1)-4(2(-1)-5)=15

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Solution for 13(-1)-4(2(-1)-5)=15 equation: 


Simplifying
13(-1) + -4(2(-1) + -5) = 15

Multiply 13 * -1
-13 + -4(2(-1) + -5) = 15

Multiply 2 * -1
-13 + -4(-2 + -5) = 15

Combine like terms: -2 + -5 = -7
-13 + -4(-7) = 15

Multiply -4 * -7
-13 + 28 = 15

Combine like terms: -13 + 28 = 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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