6x-9=-3(x+8)-21

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Solution for 6x-9=-3(x+8)-21 equation:


Simplifying
6x + -9 = -3(x + 8) + -21

Reorder the terms:
-9 + 6x = -3(x + 8) + -21

Reorder the terms:
-9 + 6x = -3(8 + x) + -21
-9 + 6x = (8 * -3 + x * -3) + -21
-9 + 6x = (-24 + -3x) + -21

Reorder the terms:
-9 + 6x = -24 + -21 + -3x

Combine like terms: -24 + -21 = -45
-9 + 6x = -45 + -3x

Solving
-9 + 6x = -45 + -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.
-9 + 6x + 3x = -45 + -3x + 3x

Combine like terms: 6x + 3x = 9x
-9 + 9x = -45 + -3x + 3x

Combine like terms: -3x + 3x = 0
-9 + 9x = -45 + 0
-9 + 9x = -45

Add '9' to each side of the equation.
-9 + 9 + 9x = -45 + 9

Combine like terms: -9 + 9 = 0
0 + 9x = -45 + 9
9x = -45 + 9

Combine like terms: -45 + 9 = -36
9x = -36

Divide each side by '9'.
x = -4

Simplifying
x = -4

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