(c-5d)-(-d+5c)= (-2.8+13)-(5.6+2.8)+(2.8-13)=

Question

(c-5d)-(-d+5c)=
(-2.8+13)-(5.6+2.8)+(2.8-13)=

Answer 1

1) (c-5d)-(-d+5c) = c-5d+d-5c = -4c-4d = -4(c+d) 
2) (-2.8+13) -(5.6+2.8) + (2.8-13) = -2.8 +13 -5.6 - 2.8 + 2.8 -13 = -8.4

Answer 2

(c-5d)-(-d+5c)=c-5d+d-5c=-4c-4d= -4(c+d)
(-2.8+13)-(5.6+2.8)+(2.8-13)=-2.8+13-5.6-2.8+2.8-13=-2.8-5.6= -8.4