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\frac{-5\left(x-3\right)}{2x^{2}+3x-20}+\frac{16x-2\left(x-8\right)+5}{2x^{2}+3x-20}
To find the opposite of 2\left(x-8\right)-5, find the opposite of each term.
\frac{-5\left(x-3\right)+16x-2\left(x-8\right)+5}{2x^{2}+3x-20}
Since \frac{-5\left(x-3\right)}{2x^{2}+3x-20} and \frac{16x-2\left(x-8\right)+5}{2x^{2}+3x-20} have the same denominator, add them by adding their numerators.
\frac{-5x+15+16x-2x+16+5}{2x^{2}+3x-20}
Do the multiplications in -5\left(x-3\right)+16x-2\left(x-8\right)+5.
\frac{9x+36}{2x^{2}+3x-20}
Combine like terms in -5x+15+16x-2x+16+5.
\frac{9\left(x+4\right)}{\left(2x-5\right)\left(x+4\right)}
Factor the expressions that are not already factored in \frac{9x+36}{2x^{2}+3x-20}.
\frac{9}{2x-5}
Cancel out x+4 in both numerator and denominator.
\frac{-5\left(x-3\right)}{2x^{2}+3x-20}+\frac{16x-2\left(x-8\right)+5}{2x^{2}+3x-20}
To find the opposite of 2\left(x-8\right)-5, find the opposite of each term.
\frac{-5\left(x-3\right)+16x-2\left(x-8\right)+5}{2x^{2}+3x-20}
Since \frac{-5\left(x-3\right)}{2x^{2}+3x-20} and \frac{16x-2\left(x-8\right)+5}{2x^{2}+3x-20} have the same denominator, add them by adding their numerators.
\frac{-5x+15+16x-2x+16+5}{2x^{2}+3x-20}
Do the multiplications in -5\left(x-3\right)+16x-2\left(x-8\right)+5.
\frac{9x+36}{2x^{2}+3x-20}
Combine like terms in -5x+15+16x-2x+16+5.
\frac{9\left(x+4\right)}{\left(2x-5\right)\left(x+4\right)}
Factor the expressions that are not already factored in \frac{9x+36}{2x^{2}+3x-20}.
\frac{9}{2x-5}
Cancel out x+4 in both numerator and denominator.