[latex] log _7(8x)-log _74=2log _73

[latex] log_{7}8x- log_{7}4=2 log_{7}3 [/latex][latex] log_{7} frac{8x}{4} = log_{7}3^2 [/latex][latex]log_{7} frac{8x}{4} = log_{7}9 [/latex][latex]log_{7}2x = log_{7}9 [/latex][latex]2x=9[/latex][latex]x=4,5[/latex]