{x>0
{x+3>0⇒x>-3
{12x-4>0⇒12x>4⇒x>1/3
x∈(1/3;∞)
lg(2x²+6x)=lg(12x-4)
2x²+6x=12x-4
2x²-6x+4=0
x²-3x+2=0
x1+x2=3 U x1*x2=2
x1=1 U x2=2
{x>0
{x+3>0⇒x>-3
{12x-4>0⇒12x>4⇒x>1/3
x∈(1/3;∞)
lg(2x²+6x)=lg(12x-4)
2x²+6x=12x-4
2x²-6x+4=0
x²-3x+2=0
x1+x2=3 U x1*x2=2
x1=1 U x2=2