12x-21=4x-21

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Solution for 12x-21=4x-21 equation:


Simplifying
12x + -21 = 4x + -21

Reorder the terms:
-21 + 12x = 4x + -21

Reorder the terms:
-21 + 12x = -21 + 4x

Add '21' to each side of the equation.
-21 + 21 + 12x = -21 + 21 + 4x

Combine like terms: -21 + 21 = 0
0 + 12x = -21 + 21 + 4x
12x = -21 + 21 + 4x

Combine like terms: -21 + 21 = 0
12x = 0 + 4x
12x = 4x

Solving
12x = 4x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4x' to each side of the equation.
12x + -4x = 4x + -4x

Combine like terms: 12x + -4x = 8x
8x = 4x + -4x

Combine like terms: 4x + -4x = 0
8x = 0

Divide each side by '8'.
x = 0

Simplifying
x = 0

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