21x+4=9x-4

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Solution for 21x+4=9x-4 equation:


Simplifying
21x + 4 = 9x + -4

Reorder the terms:
4 + 21x = 9x + -4

Reorder the terms:
4 + 21x = -4 + 9x

Solving
4 + 21x = -4 + 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.
4 + 21x + -9x = -4 + 9x + -9x

Combine like terms: 21x + -9x = 12x
4 + 12x = -4 + 9x + -9x

Combine like terms: 9x + -9x = 0
4 + 12x = -4 + 0
4 + 12x = -4

Add '-4' to each side of the equation.
4 + -4 + 12x = -4 + -4

Combine like terms: 4 + -4 = 0
0 + 12x = -4 + -4
12x = -4 + -4

Combine like terms: -4 + -4 = -8
12x = -8

Divide each side by '12'.
x = -0.6666666667

Simplifying
x = -0.6666666667

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