Answer:

c= -4

Step-by-step explanation:

½ × 2(c+2) + ½ × (5c-10) = c-13

(c+2) + ½ × (5c-10) =c-13

c+2 + ½ × (5c-10) =c-13

2+5/2c - 5 =-13

-3+5/2c =-13

-6 + 5c =-26

5c=-26 + 6

5c= -20

c=-4