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3d = 6
d = 2
4d + 3c = 23
4.2 + 3c = 23
8 + 3c = 23
3c = 23 - 8
3c = 15
c = 5
4c = e
4.5 = e
20 = e
4d+3c = 23
3c = 23 -4d
3c = 23-8 = 15
c= 5
4c = e --> e = 4(5)= 20