X+20=45,x-20=45,45-x=20
X + 20 = 45 x = 45 - 20 x = 25 __________ 25 + 20 = 45 45 = 45 х - 20 = 45 х = 45 + 20 х = 65 __________ 65 - 20 = 45 45 = 45 45 - х = 20 х = 45 - 20 х = 25 ___________ 45 - 25 = 20 25 = 25
x+20 = 45
x= 45-20
x= 25
x-20 = 45
x= 45+20
x=65
45-x=20
x=45-20
x=25