Expression calculations

Calculate:
a / 2 + 3 * 4 - 5 * 4 + 3
b / 2 + 3 * (4 - 5) * (4 + 3)
c / 2 + [3 * 4 - (5 * 4 + 3)]
d / {2 + [3 * (4 - 5)] * 4} + 3
e / 2 + {3 * [4 - 5 * (4 + 3)]}

Final Answer:

a =  -3
b =  -19
c =  -9
d =  -7
e =  -91

Step-by-step explanation:

$a=2+3\cdot 4-5\cdot 4+3=-3$

$b=2+3\cdot (4-5)\cdot (4+3)=-19$

$c=2+(3\cdot 4-(5\cdot 4+3))=-9$

$d=(2+(3\cdot (4-5))\cdot 4)+3=-7$

$e=2+(3\cdot (4-5\cdot (4+3)))=-91$

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