3^(7x-1)*12^5x=2^10x
3^(7x-1)*(3*4)^5x=2^10x
3^(7x-1)*3^5x*2^10x=2^10x
[3^(12x-1)-1]2^10x =0
2^10x 不等于0,3^(12x-1)-1=0
3^(12x-1)=1
12x-1=0
x=1/12