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\frac{5}{2\left(x-3\right)}-\frac{3}{\left(2x-6\right)^{2}}
Factor 2x-6.
\frac{5\times 2\left(x-3\right)}{4\left(x-3\right)^{2}}-\frac{3}{4\left(x-3\right)^{2}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2\left(x-3\right) and \left(2x-6\right)^{2} is 4\left(x-3\right)^{2}. Multiply \frac{5}{2\left(x-3\right)} times \frac{2\left(x-3\right)}{2\left(x-3\right)}.
\frac{5\times 2\left(x-3\right)-3}{4\left(x-3\right)^{2}}
Since \frac{5\times 2\left(x-3\right)}{4\left(x-3\right)^{2}} and \frac{3}{4\left(x-3\right)^{2}} have the same denominator, subtract them by subtracting their numerators.
\frac{10x-30-3}{4\left(x-3\right)^{2}}
Do the multiplications in 5\times 2\left(x-3\right)-3.
\frac{10x-33}{4\left(x-3\right)^{2}}
Combine like terms in 10x-30-3.
\frac{10x-33}{4x^{2}-24x+36}
Expand 4\left(x-3\right)^{2}.
\frac{5}{2\left(x-3\right)}-\frac{3}{\left(2x-6\right)^{2}}
Factor 2x-6.
\frac{5\times 2\left(x-3\right)}{4\left(x-3\right)^{2}}-\frac{3}{4\left(x-3\right)^{2}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2\left(x-3\right) and \left(2x-6\right)^{2} is 4\left(x-3\right)^{2}. Multiply \frac{5}{2\left(x-3\right)} times \frac{2\left(x-3\right)}{2\left(x-3\right)}.
\frac{5\times 2\left(x-3\right)-3}{4\left(x-3\right)^{2}}
Since \frac{5\times 2\left(x-3\right)}{4\left(x-3\right)^{2}} and \frac{3}{4\left(x-3\right)^{2}} have the same denominator, subtract them by subtracting their numerators.
\frac{10x-30-3}{4\left(x-3\right)^{2}}
Do the multiplications in 5\times 2\left(x-3\right)-3.
\frac{10x-33}{4\left(x-3\right)^{2}}
Combine like terms in 10x-30-3.
\frac{10x-33}{4x^{2}-24x+36}
Expand 4\left(x-3\right)^{2}.