21=5+4X

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Solution for 21=5+4X equation:


Simplifying
21 = 5 + 4X

Solving
21 = 5 + 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.
21 + -4X = 5 + 4X + -4X

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

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

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

Combine like terms: 5 + -21 = -16
-4X = -16

Divide each side by '-4'.
X = 4

Simplifying
X = 4

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