7х+7у 7(x+y) x+y
_____ = ________= _______
21 21 3
8m-4n 4(2m-n) 2m-n
______= _______= ______
4m 4m m
9a+12b 3(3a+4b)
_______ = ________= 3a+4b
3 3
45c+18d 9(5c+2d) 5c+2d
________=__________=_______
27d 27d 3d
5x-xy x(5-y)
_____=________= 5-y
x x
6mn-4m 2m(3n-2 )
________= _________= 3n-2
2m 2m