x+21=4x+6

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Solution for x+21=4x+6 equation:


Simplifying
x + 21 = 4x + 6

Reorder the terms:
21 + x = 4x + 6

Reorder the terms:
21 + x = 6 + 4x

Solving
21 + x = 6 + 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 + x + -4x = 6 + 4x + -4x

Combine like terms: x + -4x = -3x
21 + -3x = 6 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + -3x = 6 + 0
21 + -3x = 6

Add '-21' to each side of the equation.
21 + -21 + -3x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 6 + -21
-3x = 6 + -21

Combine like terms: 6 + -21 = -15
-3x = -15

Divide each side by '-3'.
x = 5

Simplifying
x = 5

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