Question

2,3m+(4,3-7,1)-(9,2n+4,5)-(2,3-1,3n)-5,7

Answer 1

$2,3m+(4,3-7,1)-(9,2n+4,5)-(2,3-1,3n)-5,7=$
$=23m+(43-71)-(92n+45)-(23-13n)-57=$
$=23m-28-92n-45-23+13n-57=$
$=23m-153-79n$