Răspuns :
{[(a×5 )+42 ]÷7 } - 11 = 200
[ ( a×5 ) + 42 ] : 7 = 200 + 11
[ ( a × 5 ) + 42 ] : 7 = 211
( a ×5 ) + 42 = 211 × 7
( a ×5 ) + 42 = 1.477
a×5 = 1.477 - 42
a × 5 = 1.435
a = 1.435 : 5
a = 287
[ ( a×5 ) + 42 ] : 7 = 200 + 11
[ ( a × 5 ) + 42 ] : 7 = 211
( a ×5 ) + 42 = 211 × 7
( a ×5 ) + 42 = 1.477
a×5 = 1.477 - 42
a × 5 = 1.435
a = 1.435 : 5
a = 287
{[(nx5)+42]:7}-11=200
{[(nx5)+42]:7}=200+11
[(nx5)+42]:7=211
[(nx5)+42]=211x7
(nx5)+42=1477
nx5=1477-42
nx5=1435
n=1435:5
n=287