7x+21=7x-4

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Solution for 7x+21=7x-4 equation:


Simplifying
7x + 21 = 7x + -4

Reorder the terms:
21 + 7x = 7x + -4

Reorder the terms:
21 + 7x = -4 + 7x

Add '-7x' to each side of the equation.
21 + 7x + -7x = -4 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 + 0 = -4 + 7x + -7x
21 = -4 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 = -4 + 0
21 = -4

Solving
21 = -4

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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