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

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


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

Reorder the terms:
-9(-9 + x) = 6x + 21
(-9 * -9 + x * -9) = 6x + 21
(81 + -9x) = 6x + 21

Reorder the terms:
81 + -9x = 21 + 6x

Solving
81 + -9x = 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.
81 + -9x + -6x = 21 + 6x + -6x

Combine like terms: -9x + -6x = -15x
81 + -15x = 21 + 6x + -6x

Combine like terms: 6x + -6x = 0
81 + -15x = 21 + 0
81 + -15x = 21

Add '-81' to each side of the equation.
81 + -81 + -15x = 21 + -81

Combine like terms: 81 + -81 = 0
0 + -15x = 21 + -81
-15x = 21 + -81

Combine like terms: 21 + -81 = -60
-15x = -60

Divide each side by '-15'.
x = 4

Simplifying
x = 4

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