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((9*x-15)^1)/2 = ((5*x-3)^1)/2 // - ((5*x-3)^1)/2
((9*x-15)^1)/2-(((5*x-3)^1)/2) = 0
(9*x-15)/2-((5*x-3)/2) = 0
(9*x-15)/2+(-1*(5*x-3))/2 = 0
9*x-1*(5*x-3)-15 = 0
4*x-12 = 0
(4*x-12)/2 = 0
(4*x-12)/2 = 0 // * 2
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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