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(x-)(5x+9)=0
We simplify the equation to the form, which is simple to understand
(x-)*(5x+9)=0
Reorder the terms in parentheses
We move all terms containing x to the left and all other terms to the right.
0=0
We simplify left and right side of the equation.
0=0
0=0
This equation is an identity, so all real numbers are solutions.
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