log(x+7)+log(x+6)-(x+10)=0

log (x + 7)(x + 6)/(x + 10) = 0
(x² + 13x + 42)/(x + 10) = 1
x² + 13x + 42 = x + 10
x² + 12x + 32 = 0
(x + 4)(x + 8) = 0
x = 4 atau x = 8