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Simplifying
9x(x + 9x) = 0
Combine like terms: x + 9x = 10x
9x(10x) = 0
Remove parenthesis around (10x)
9x * 10x = 0
Reorder the terms for easier multiplication:
9 * 10x * x = 0
Multiply 9 * 10
90x * x = 0
Multiply x * x
90x2 = 0
Solving
90x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '90'.
x2 = 0.0
Simplifying
x2 = 0.0
Take the square root of each side:
x = {0.0}
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