5-2b-7-10b-3c-5x-(18ca-63cy-12xa+42xy)-(55ap+45ac-77yp-63yc)-12-11p-9c= -14-12b-12c-5x-11p-18ca+63cy+12xa-42xy-55ap-45ac+77yp+63yc=
1/x+1/(x²+5x)=(3+x)/(x+5) ОДЗ: x≠0 x≠-5
1/x+1/(x(x+5))=(3+x)/(x+5)
x+5+1=3x+x²
x²+2x-6=0 D=28
x₁=-1+√7 x₂=-1-√7.
6-4x=4-6*(x-7)
6-4x=4-6x+42
6-4x=46-6x
-4x+6x=46-6
2x=40
x=20