$B = 12+7\times(-6) =$

$R = 17+12\div(4-6) =$

$A = 16-30\div 5 + 15 =$

$-24-12 = $  

$(-42)\times(-3) = $

$L = \dfrac{-48+104}{7} =$

$24-(-21) = $  

$F = 2\times(-3)- 11 \times (-8) =$

$\dfrac{39}{-3} = $

$(-2)\times 16 = $