X + x/9 = 6 | * 9
9x+x=54
10x=54
x=5.4
1)4x/y*y/12x=4/y*y/12=4*1/2=1/3
2)a^3b/15c*(-3c/a^2b^2)=-a^3/15*3*1/a^2b^2=-a/15*3*1/b=-a/5b
3)24p^6/35q^4*49q/16p^4=24p^2/35q^3*49/16=3p^2/5q^3*7/2=21p^2/10q^3
4)18y^3*4x^2/9y^5=2*4x^2/y^2=8x^2/y^2
5)28m^5/23n^4*46n^6=28m^5*2n^2=56m^5n^2
=-32а^15b^5/c^2.............