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x=?
K=5x+1
64=4(5x+1)
64=20x+4
64-4=20x
60=20x
60/20=x
x=3
64 = 4 (5x + 1)
5x+1 = 64/4
5x+1 =16
5x = 16 - 1
= 15
x = 15/5
x = 3