(0,5)^x = 1/64 (3/7)^3x-7 = (7/3)^7x-3

[latex]( \frac{1}{2})^x = \frac{1}{64} \\2^{-x} = 2^{-6} \\ x=6[/latex] [latex]( \frac{3}{7} )^{3x-7} = ( \frac{7}{3} )^{7x-3} \\ ( \frac{3}{7} )^{3x-7} = ( \frac{3}{7} )^{-7x+3} \\ 3x-7=-7x+3 \\ 10x=10 \\ x=1[/latex]