$\frac{ 5x-3 }{ -15x+9 }$
Factor out $-3$ from the expression$\frac{ 5x-3 }{ -3\left( 5x-3 \right) }$
Cancel out the common factor $5x-3$$\frac{ 1 }{ -3 }$
Use $\frac{ -a }{ b }=\frac{ a }{ -b }=-\frac{ a }{ b }$ to rewrite the fraction$\frac{ 1 }{ -3 }$