7x*6x=168

42x^2=168

x^2=4

x=2 и x=-2

5) ((3^5)*(x^15)*(3^4)*(x^12))/((3^8)*(x^24))=24

(3*(x^3))=24

x^3=8

x=2

((3x^3)^5*(3x^3)^4)/(9x^6)^4=24

(3x^3)^9/(3x^3)^8=24

3x^3=24

x^3=8

x=2