Answer:
88.2
Explanation:
1) Find d
-20 = d + 6 original equation
-20 - 6 = d subtract 6 from both sides to isolate the variable
-26 = d simplify like terms
d = -26 answer
2) Plug it in expression
5 - 3.2d original expression
5 - 3.2 (-26) substitute value d for -26 (as calculated above)
5 + 83.2 PEMDAS (multiply first...don't subtract 5-3.2 and then multiply!)
88.2 simplify like terms and here is your answer