Question

afla valoarea fiecarei litera: (138*5-21:7-300*2)-9*9-r*2=2

Answer 1

(138*5-21:7-300*2)-9*9-r*2=2
(690-3-600)-81-r*2=2
87-81-r*2=2
6-r*2=2
r*2=4
r=4:2=2

Answer 2

(690-3-600)-81-2r=2
87-2r=2+81
87-2r=83
87-83=2r
4=2r
4:2=r
2=r