x(4x+5x)=81

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Solution for x(4x+5x)=81 equation: 


Simplifying
x(4x + 5x) = 81

Combine like terms: 4x + 5x = 9x
x(9x) = 81

Remove parenthesis around (9x)
x * 9x = 81

Reorder the terms for easier multiplication:
9x * x = 81

Multiply x * x
9x2 = 81

Solving
9x2 = 81

Solving for variable 'x'.

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

Divide each side by '9'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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