4x-21=4

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Solution for 4x-21=4 equation: 


Simplifying
4x + -21 = 4

Reorder the terms:
-21 + 4x = 4

Solving
-21 + 4x = 4

Solving for variable 'x'.

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

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

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

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

Divide each side by '4'.
x = 6.25

Simplifying
x = 6.25

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