^3log(-4)+^3 log(x+4)=12 mohon cara kerjanya juga

^3log(-4) +^3log(x+4)=12
^3log(-4(x+4))=12
^3log(-4x+16)=12
12=^3log3^12
^3log(-4x+16)=^3log(3^12)
^3log(-4x+16)=^3log(531441)
-4x+16=531441
-4x=531425
=-132856,25