[tex]\frac{12x-5y}{3x}=\frac{2}{3}\\\\2*3x=3*(12x-5y)\\\\6x=36x-15y\\\\15y=36x-6x\\\\15y=30x\\\\y=2x\\\\\frac{x}{y}=\frac{x}{2x}=\frac{1}{2}\\\\\frac{x^{2}+x*y}{y^{2}}=\frac{x^{2}+x*2x}{2^{2}x^{2}}\\\\\frac{x^{2}+2x^{2}}{4x^{2}}=\frac{3x^{2}}{4x^{2}}=\frac{3}{4}[/tex]
