21x+4=12x-8

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Solution for 21x+4=12x-8 equation:


Simplifying
21x + 4 = 12x + -8

Reorder the terms:
4 + 21x = 12x + -8

Reorder the terms:
4 + 21x = -8 + 12x

Solving
4 + 21x = -8 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
4 + 21x + -12x = -8 + 12x + -12x

Combine like terms: 21x + -12x = 9x
4 + 9x = -8 + 12x + -12x

Combine like terms: 12x + -12x = 0
4 + 9x = -8 + 0
4 + 9x = -8

Add '-4' to each side of the equation.
4 + -4 + 9x = -8 + -4

Combine like terms: 4 + -4 = 0
0 + 9x = -8 + -4
9x = -8 + -4

Combine like terms: -8 + -4 = -12
9x = -12

Divide each side by '9'.
x = -1.333333333

Simplifying
x = -1.333333333

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