7х+7у)/21=(7(х+у))/(7*3)=(х+у)/3
(8m-4n)/8m=(4(2m-n)) /4*2m=(2m-n)/2m
(9a+12b)/3=(3(3a+4b))/3=3a+4b
(45c+18d)/27d=(9(5c+2d))/9*3d=(5c+2d)/3d
(5x-xy)/x=x(5-y)/x=5-y
(6mn-4m)/2m=(2m(3n-1))/2m=3n-1
7х+7у)/21=(7(х+у))/(7*3)=(х+у)/3
(8m-4n)/8m=(4(2m-n)) /4*2m=(2m-n)/2m
(9a+12b)/3=(3(3a+4b))/3=3a+4b
(45c+18d)/27d=(9(5c+2d))/9*3d=(5c+2d)/3d
(5x-xy)/x=x(5-y)/x=5-y
(6mn-4m)/2m=(2m(3n-1))/2m=3n-1