If you are using the X to mean multiply, then the answer is -18. Otherwise, if this is algebra, and the X is a variable, then numbers against a variable always means to multiply, so it would simplify to -18X.
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The property used to rewrite 9x2 + 9x3 is the Distributive Property. Using the Distributive Property the expression can be rewritten as 9x2 + 9x2 + 9x2 or 27x2.
3x2(x2 - 3)
This is an expression, not an equation. Expressions cannot be solved.
-5y2+3x+2y
The expression cannot be simplified.