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 

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