a := 6b := 2b := a/2*ba := 2*a+3*b
a := 12b := 8 + a / 2a := a – b / 2
a := 1b := 4a := 2*a+3*bb := a/2*b
a := 4b := 9b := 6 * b – aa := b / 5 * 3 – a
a := 4b := 15a := b-a*3b := 24/a*4
f := 100e := 25f := 2*f+50e := f–150–e*2
b := 5a := -3a := 7 + a * bb := a / 2 + b
b := 3a := -8b := 7 - a + ba := a / 2 + b
a := 7b := 2a := b * 4 + a * 3b := 30 - a
a := 2b := 20a := b + a / 2b := 24 - a