Answer:
c = -13.78
Explanation:
21.2x + c =5.3(4x - 2.6)
Use distributive property: a*(b + c) = (a*b) + (a * c)
21.2x + c = 5.3*4x - 5.3*2.6
21.2x + c = 21.2x - 13.78
Now to find the value of c, isolate 'c'. So, subtract 21.2x form both sides
21.2x + c - 21.2x = 21.2x - 13.78 - 21.2x
c = -13.78