Solve sin(5x)cos(7x)cos(5x)sin(7x)=0.7\displaystyle {\sin{{\left({5}{x}\right)}}}{\cos{{\left({7}{x}\right)}}}-{\cos{{\left({5}{x}\right)}}}{\sin{{\left({7}{x}\right)}}}=-{0.7} for the smallest positive solution.

x =  

Give your answer accurate to two decimal places.