b=-7x8-2x[5-3x(-5-1)]x(-5) c=-4x5-6x[2-100:(-13-7)]

b= -7x8-2x[5-3x(-5-1)]x(-5)

  = -7x8-2x[5-3x(-6)]x(-5)

  = -7x8-2x[5+18]x(-5)

  = -7x8-2x23x(-5)

  = -7x (-40)-2x23

  = 280 - 46= 234

c= -4x5-6x[2-100:(-13-7)]

  = -4x5-6x[2-100:(-20)]

  = -4x5-6x[2+50]

  = -4x5-6x52

  = -20 -312= -32

Voilà;) Niinii:)