Răspuns :
(x+540:6)=30*7-100:20
(x+540:6)=210-5
(x+540:6)=205
(x+90)=205
x=205-90
x=105
(x+540:6)=210-5
(x+540:6)=205
(x+90)=205
x=205-90
x=105
[(x+540:6)*7-100]:20=30
[(x+540:6)*7-100]=30*20 =600
(x+540:6)*7 = 600+100 =700
(x+540:6) = 700:7 =100
x+90 = 100
x = 100-90
x = 10
[(x+540:6)*7-100]=30*20 =600
(x+540:6)*7 = 600+100 =700
(x+540:6) = 700:7 =100
x+90 = 100
x = 100-90
x = 10