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51 = x+(1/5)*x // - x+(1/5)*x
51-x-((1/5)*x) = 0
(-1/5)*x-x+51 = 0
51-6/5*x = 0 // - 51
-6/5*x = -51 // : -6/5
x = -51/(-6/5)
x = 85/2
x = 85/2
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