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12 = 15*(x-(1/5)) // - 15*(x-(1/5))
12-(15*(x-(1/5))) = 0
12-15*(x-1/5) = 0
12-15*(x-1/5) = 0
15-15*x = 0
15-15*x = 0
15-15*x = 0 // - 15
-15*x = -15 // : -15
x = -15/(-15)
x = 1
x = 1
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