3x+13=9x-8

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Solution for 3x+13=9x-8 equation:


Simplifying
3x + 13 = 9x + -8

Reorder the terms:
13 + 3x = 9x + -8

Reorder the terms:
13 + 3x = -8 + 9x

Solving
13 + 3x = -8 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
13 + 3x + -9x = -8 + 9x + -9x

Combine like terms: 3x + -9x = -6x
13 + -6x = -8 + 9x + -9x

Combine like terms: 9x + -9x = 0
13 + -6x = -8 + 0
13 + -6x = -8

Add '-13' to each side of the equation.
13 + -13 + -6x = -8 + -13

Combine like terms: 13 + -13 = 0
0 + -6x = -8 + -13
-6x = -8 + -13

Combine like terms: -8 + -13 = -21
-6x = -21

Divide each side by '-6'.
x = 3.5

Simplifying
x = 3.5

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