Aidez moi je ne comprend pas svp c'est pour demain .(calcul Littéral)

a = 8c-50
a = 8(4) -50
a = 32-50
a = -18


b = 6-5c+7
b = 6-5(4) +7
b = 6-20+7
b =13-20
b = -7

a = 8c-50
a = 8(4) -50
a = 32-50
a = -17


b = 6-5c+7
b = 6-5(4) +7
b = 6-20+7
b =13-20
b = -7