Respuesta :

xsychic

hi <3

lets solve for c first

5c + 15 = 21

subtract 15 from both sides:

5c = 6

divide both sides by 5:

c = 6/5

now substitute the value for c into the equation

5(6/5) + 18 = 24

thus, your answer is 24

hope this helps :)

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