4x-21=x-1

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Solution for 4x-21=x-1 equation:


Simplifying
4x + -21 = x + -1

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

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

Solving
-21 + 4x = -1 + x

Solving for variable 'x'.

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

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

Combine like terms: 4x + -1x = 3x
-21 + 3x = -1 + x + -1x

Combine like terms: x + -1x = 0
-21 + 3x = -1 + 0
-21 + 3x = -1

Add '21' to each side of the equation.
-21 + 21 + 3x = -1 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = -1 + 21
3x = -1 + 21

Combine like terms: -1 + 21 = 20
3x = 20

Divide each side by '3'.
x = 6.666666667

Simplifying
x = 6.666666667

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