21x-7-15x+3=21x-4-15x+13

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Solution for 21x-7-15x+3=21x-4-15x+13 equation:


Simplifying
21x + -7 + -15x + 3 = 21x + -4 + -15x + 13

Reorder the terms:
-7 + 3 + 21x + -15x = 21x + -4 + -15x + 13

Combine like terms: -7 + 3 = -4
-4 + 21x + -15x = 21x + -4 + -15x + 13

Combine like terms: 21x + -15x = 6x
-4 + 6x = 21x + -4 + -15x + 13

Reorder the terms:
-4 + 6x = -4 + 13 + 21x + -15x

Combine like terms: -4 + 13 = 9
-4 + 6x = 9 + 21x + -15x

Combine like terms: 21x + -15x = 6x
-4 + 6x = 9 + 6x

Add '-6x' to each side of the equation.
-4 + 6x + -6x = 9 + 6x + -6x

Combine like terms: 6x + -6x = 0
-4 + 0 = 9 + 6x + -6x
-4 = 9 + 6x + -6x

Combine like terms: 6x + -6x = 0
-4 = 9 + 0
-4 = 9

Solving
-4 = 9

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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