21x+6=3x-3

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Solution for 21x+6=3x-3 equation:


Simplifying
21x + 6 = 3x + -3

Reorder the terms:
6 + 21x = 3x + -3

Reorder the terms:
6 + 21x = -3 + 3x

Solving
6 + 21x = -3 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
6 + 21x + -3x = -3 + 3x + -3x

Combine like terms: 21x + -3x = 18x
6 + 18x = -3 + 3x + -3x

Combine like terms: 3x + -3x = 0
6 + 18x = -3 + 0
6 + 18x = -3

Add '-6' to each side of the equation.
6 + -6 + 18x = -3 + -6

Combine like terms: 6 + -6 = 0
0 + 18x = -3 + -6
18x = -3 + -6

Combine like terms: -3 + -6 = -9
18x = -9

Divide each side by '18'.
x = -0.5

Simplifying
x = -0.5

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