4x-4=21-x

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


Simplifying
4x + -4 = 21 + -1x

Reorder the terms:
-4 + 4x = 21 + -1x

Solving
-4 + 4x = 21 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
-4 + 4x + x = 21 + -1x + x

Combine like terms: 4x + x = 5x
-4 + 5x = 21 + -1x + x

Combine like terms: -1x + x = 0
-4 + 5x = 21 + 0
-4 + 5x = 21

Add '4' to each side of the equation.
-4 + 4 + 5x = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5x = 21 + 4
5x = 21 + 4

Combine like terms: 21 + 4 = 25
5x = 25

Divide each side by '5'.
x = 5

Simplifying
x = 5

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