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Simplifying
3x * -3x = 0
Reorder the terms for easier multiplication:
3 * -3x * x = 0
Multiply 3 * -3
-9x * x = 0
Multiply x * x
-9x2 = 0
Solving
-9x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '-9'.
x2 = 0
Simplifying
x2 = 0
Take the square root of each side:
x = {0}
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