3x+9=5x-21

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


Simplifying
3x + 9 = 5x + -21

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

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

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

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

Combine like terms: 5x + -5x = 0
9 + -2x = -21 + 0
9 + -2x = -21

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

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

Combine like terms: -21 + -9 = -30
-2x = -30

Divide each side by '-2'.
x = 15

Simplifying
x = 15

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