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\frac{2x-5}{x\left(x-3\right)}-\frac{12x\left(x-3\right)}{x\left(x-3\right)}
To add or subtract expressions, expand them to make their denominators the same. Multiply 12 times \frac{x\left(x-3\right)}{x\left(x-3\right)}.
\frac{2x-5-12x\left(x-3\right)}{x\left(x-3\right)}
Since \frac{2x-5}{x\left(x-3\right)} and \frac{12x\left(x-3\right)}{x\left(x-3\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{2x-5-12x^{2}+36x}{x\left(x-3\right)}
Do the multiplications in 2x-5-12x\left(x-3\right).
\frac{38x-5-12x^{2}}{x\left(x-3\right)}
Combine like terms in 2x-5-12x^{2}+36x.
\frac{38x-5-12x^{2}}{x^{2}-3x}
Expand x\left(x-3\right).
\frac{2x-5}{x\left(x-3\right)}-\frac{12x\left(x-3\right)}{x\left(x-3\right)}
To add or subtract expressions, expand them to make their denominators the same. Multiply 12 times \frac{x\left(x-3\right)}{x\left(x-3\right)}.
\frac{2x-5-12x\left(x-3\right)}{x\left(x-3\right)}
Since \frac{2x-5}{x\left(x-3\right)} and \frac{12x\left(x-3\right)}{x\left(x-3\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{2x-5-12x^{2}+36x}{x\left(x-3\right)}
Do the multiplications in 2x-5-12x\left(x-3\right).
\frac{38x-5-12x^{2}}{x\left(x-3\right)}
Combine like terms in 2x-5-12x^{2}+36x.
\frac{38x-5-12x^{2}}{x^{2}-3x}
Expand x\left(x-3\right).