-21-5x=3x+9

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Solution for -21-5x=3x+9 equation:


Simplifying
-21 + -5x = 3x + 9

Reorder the terms:
-21 + -5x = 9 + 3x

Solving
-21 + -5x = 9 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-21 + -5x + -3x = 9 + 3x + -3x

Combine like terms: -5x + -3x = -8x
-21 + -8x = 9 + 3x + -3x

Combine like terms: 3x + -3x = 0
-21 + -8x = 9 + 0
-21 + -8x = 9

Add '21' to each side of the equation.
-21 + 21 + -8x = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -8x = 9 + 21
-8x = 9 + 21

Combine like terms: 9 + 21 = 30
-8x = 30

Divide each side by '-8'.
x = -3.75

Simplifying
x = -3.75

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