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(x/1+x/y):(x/1-x/y)=(y+1)/(y-1)
1)x/1+x/y=(xy+x)/y=x(y+1)/y
2)x/1-x/y=(xy-x)/y=x(y-1)/y
3)x(y+1)/y:x(y-1)/y=x(y+1)/y*y/x(y-1)=(y+1)/(y-1)


(a/b+(a+b)/(a-b)*ab/(a+b)=ab/(a-b)
1) a/b+(a+b)/(a-b)=(a-ab)/b(a-b)+(ab+b)/b(a-b)=(a+b)/b(a-b)
2) (a+b)/b(a-b) *ab/(a+b)=ab/(a-b)



(m/(m-1)-1/1):m/(mn-n)=n/m
1) m/(m-1)-1/1=m/(m-1)-(m-1)/(m-1)=1/(m-1)
2)1/(m-1):m/n(m-1)=1/(m-1)*n(m-1)/m=n/m


(a/b-b/a)*4ab/(a-b)=4a+4b
1)a/b-b/a=a/ab-b/ab=(a-b)(a+b)/ab
2) (a-b)(a+b)/ab *4ab/(a-b)=4a+4b


a/b-(a-b)/b:(a+b)/b=1
1)(a-b)(a+b)/b:(a+b)/b= (a-b)(a+b)/b*b/(a+b)=(a-b)/b
2)a/b-(a-b)/b=b/b=1


7x/(x+2)-(x-8)/(3x+6)*84/(x-8x)= (21x-84)/(3x+6x)
1)(x-8)/3(x+2)*84/x(x-8)=84/3x(x+2)
2)7x/(x+2)-84/3x(x+2)=(21x-84)/3x(x+2)=
(21x-84)/(3x+6x)



(a/1-(9a-9)/(a+3):(a-3a)/(a+3)=a
1)a/1-9(a-1)/(a+3)=(a+3a-9a+9)/(a+3)=
(a-6a+9)/(a+3)=(a-3)/(a+3)
2)(a-3)/(a+3):a(a-3)/(a+3)=(a-3)/(a+3)*(a+3)/a(a-3)=a


(a/(a+2)-8/(a+8)*(a+8a)/(a-4)= (a+4)/(a+2a)

1) a/(a+2)-8/(a+8)=(a+8a-8a-16)/(a+8)(a+2)=(a-16)/(a+8)(a+2)=(a-4)(a+4)/(a+8)(a+2)
2) (a-4)(a+4)/(a+8)(a+2)*a(a+8)/(a-4)=
(a+4)/(a+2a)