Question 367636
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Hi, 
-2/5(10c + 15)=10 
Mulitplying boh sides of the equation by 5 so as all denominators = 1
-2(10c + 15) = 50
Applying distributive principle
-20c -30 = 50
-20c = 80
c = -4

checking our answer
(-2/5)*-25 = 10