Question

36-42:e:(15:3-4:1)-20=10 ajutatima varog!

Answer 1

36-42:e:(15:3-4:1)-20=10
36-42:e:(5-4)=20+10
36-42:e:1=30
36-42:e=30x1
36-42:e=30
42:e=36-30
42:e=6
e=42:6
e=7

Answer 2

36-42 / e / (5-4)-20=10
36-42 / e / 1-20 = 10
36-42 / e / 1 = 10+20
36-42 / e / 1=30
36-42 / e = 30*1
36 - 42 / e = 30
36-30 = 42/e
6 = 42/e
e = 42/6
e = 7
*  = semnul inmultirii
/ = semnul impartirii