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(1/3)*x = 3*x-(4/5) // - 3*x-(4/5)
(1/3)*x-(3*x)+4/5 = 0
(1/3)*x-3*x+4/5 = 0
4/5-8/3*x = 0 // - 4/5
-8/3*x = -4/5 // : -8/3
x = -4/5/(-8/3)
x = 3/10
x = 3/10
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