X^2+6x=x(x+6).
x1=0, x2=-6.
x1=81-(0)^2=81.
x2=81-(-6)^2=81-36=107
A^5*(a^5)^2= a^5*a^10=a^15; b^3b^7/b^2=b^10/b^2=b^8; 4a^3*(-3a^2b^5)=-12a^5b^5; 6b^2c^4/8bc^5=3b/4c.
4 2/3-x+1/3= 3 2/5
-x=3 2/5-1/3-4 2/3
-x=3 6/15-5/15- 4 10/15
-x=-1 9/15
x=1 3/5
x=1,6