$$5(y-1)-3(x-7)=1$$$$\frac { 2 }{ 3 } y+\frac { 20+x }{ 3 } =1$$$$\Leftrightarrow$$$$5y-5-3x+21=1$$$$2y+20+x=3$$$$\Leftrightarrow$$$$5y=3x-15$$$$6y=-3x-51$$$$\Leftrightarrow$$$$5y=3x-15$$$$y=-6x-36$$$$\Leftrightarrow$$$$5(-6x-36)=3x-15$$$$y=-6x-36$$$$\Leftrightarrow$$$$-30x-180=3x-15$$$$y=-6x-36$$$$\Leftrightarrow$$$$33x=-165$$$$y=-6x-36$$$$\Leftrightarrow$$$$x=-5$$$$y=-6x-36$$$$\Leftrightarrow$$$$x=-5$$$$y=-6*(-5)-36$$$$\Leftrightarrow$$$$ x=-5$$$$y=-6$$