Răspuns :
[(a-416:4+2)x5+3]x2=1986
(a-104+2)x5+3=1986:2
(a-104+2)x5=993-3
a-104+2=990:5
a-104=198-2
a=196+104
a=300
(a-104+2)x5+3=1986:2
(a-104+2)x5=993-3
a-104+2=990:5
a-104=198-2
a=196+104
a=300
(a-104+2)x5 +3=1986:2
(a-104+2)x5=993-3
a-104+2=990:5
a-104=198-2
a=196+104
a=300
(a-104+2)x5=993-3
a-104+2=990:5
a-104=198-2
a=196+104
a=300