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(1/3)*x-5 = 3*x-15 // - 3*x-15
(1/3)*x-(3*x)-5+15 = 0
(1/3)*x-3*x-5+15 = 0
10-8/3*x = 0 // - 10
-8/3*x = -10 // : -8/3
x = -10/(-8/3)
x = 15/4
x = 15/4
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