Differential Equations

$x-2 y+\log |3 x-4 y+6|=C$

$5 x-15 y-4 \log |15 x-20 y-12|=C$

$5 x-15 y+14 \log |15 x-20 y-12|=C$

$8 y-4 x+\log |9 x-12 y+4|=C$