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51 = (3/5)*x // - (3/5)*x
51-((3/5)*x) = 0
(-3/5)*x+51 = 0
51-3/5*x = 0 // - 51
-3/5*x = -51 // : -3/5
x = -51/(-3/5)
x = 85
x = 85
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