21=-5x+3x+9

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


Simplifying
21 = -5x + 3x + 9

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

Combine like terms: -5x + 3x = -2x
21 = 9 + -2x

Solving
21 = 9 + -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
21 + 2x = 9 + -2x + 2x

Combine like terms: -2x + 2x = 0
21 + 2x = 9 + 0
21 + 2x = 9

Add '-21' to each side of the equation.
21 + -21 + 2x = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 9 + -21
2x = 9 + -21

Combine like terms: 9 + -21 = -12
2x = -12

Divide each side by '2'.
x = -6

Simplifying
x = -6

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