bjr

8*x + 8*7 = 8x + 56

7*x + 7*y = 7x+7y

9*5 + 9*m = 9m + 45

x*2 + x*(-y) = -xy + 2x

7*6 + 7*a = 7a + 42

9*7 + 9*(-x) = -9x + 63

32

3x

20

8a

xy

6m

28b

7ab

2pi