4x=21-x

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Solution for 4x=21-x equation:


Simplifying
4x = 21 + -1x

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

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

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

Divide each side by '5'.
x = 4.2

Simplifying
x = 4.2

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