21=4x-1x+2x

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Solution for 21=4x-1x+2x equation:


Simplifying
21 = 4x + -1x + 2x

Combine like terms: 4x + -1x = 3x
21 = 3x + 2x

Combine like terms: 3x + 2x = 5x
21 = 5x

Solving
21 = 5x

Solving for variable 'x'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -5x = 0 + -21

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

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

Divide each side by '-5'.
x = 4.2

Simplifying
x = 4.2

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