[ ( 306 × 103 - 1751 × 18 ) × 2 + 350 ] × 10 =
[ ( 31518 - 31518 ) × 2 + 350 ] × 10 =
( 0 × 2 + 350 ) × 10 =
( 0 + 350 ) × 10 =
350 × 10 = 3500