3x-9=-21+6x

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Solution for 3x-9=-21+6x equation:


Simplifying
3x + -9 = -21 + 6x

Reorder the terms:
-9 + 3x = -21 + 6x

Solving
-9 + 3x = -21 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
-9 + 3x + -6x = -21 + 6x + -6x

Combine like terms: 3x + -6x = -3x
-9 + -3x = -21 + 6x + -6x

Combine like terms: 6x + -6x = 0
-9 + -3x = -21 + 0
-9 + -3x = -21

Add '9' to each side of the equation.
-9 + 9 + -3x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -3x = -21 + 9
-3x = -21 + 9

Combine like terms: -21 + 9 = -12
-3x = -12

Divide each side by '-3'.
x = 4

Simplifying
x = 4

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