21=6+-x+-4x

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


Simplifying
21 = 6 + -1x + -4x

Combine like terms: -1x + -4x = -5x
21 = 6 + -5x

Solving
21 = 6 + -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 = 6 + -5x + 5x

Combine like terms: -5x + 5x = 0
21 + 5x = 6 + 0
21 + 5x = 6

Add '-21' to each side of the equation.
21 + -21 + 5x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + 5x = 6 + -21
5x = 6 + -21

Combine like terms: 6 + -21 = -15
5x = -15

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

Simplifying
x = -3

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