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3 = (4/5)*x // - (4/5)*x
3-((4/5)*x) = 0
(-4/5)*x+3 = 0
3-4/5*x = 0 // - 3
-4/5*x = -3 // : -4/5
x = -3/(-4/5)
x = 15/4
x = 15/4
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