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15 = (4*x-2)/5 // - (4*x-2)/5
15-((4*x-2)/5) = 0
(-1*(4*x-2))/5+15 = 0
(-1*(4*x-2))/5+(5*15)/5 = 0
5*15-1*(4*x-2) = 0
77-4*x = 0
(77-4*x)/5 = 0
(77-4*x)/5 = 0 // * 5
77-4*x = 0
77-4*x = 0 // - 77
-4*x = -77 // : -4
x = -77/(-4)
x = 77/4
x = 77/4
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