Question

50-2x{7+8:2-[9-3x(5-4)]}

Answer 1

50 -2x{7 +8:2 -[ 9 -3x (5-4) ] } =
50 -2x{7  +4   -[ 9 -3 . (1)}  =
50 -2.{7   +4  - [ 9    -3]} =
50 -2.{7 +4 -9 +3} =
50 -2.{14 - 9} =
50 -2.{5} =
50 - 10 =
40

Answer 2

Boa noite Amanda

50 - 2*(7 + 8/2 - (9 - 3*(5 - 4)))
50 - 2*(7 + 4 - (9 - 3*1))
50 - 2*(7 + 4 - 6)
50 - 2*5 = 50 - 10 = 40