9[x-4]=81

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Solution for 9[x-4]=81 equation: 


Simplifying
9[x + -4] = 81

Reorder the terms:
9[-4 + x] = 81
[-4 * 9 + x * 9] = 81
[-36 + 9x] = 81

Solving
-36 + 9x = 81

Solving for variable 'x'.

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

Add '36' to each side of the equation.
-36 + 36 + 9x = 81 + 36

Combine like terms: -36 + 36 = 0
0 + 9x = 81 + 36
9x = 81 + 36

Combine like terms: 81 + 36 = 117
9x = 117

Divide each side by '9'.
x = 13

Simplifying
x = 13

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