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((10*x-25)^1)/2 = x // - x
((10*x-25)^1)/2-x = 0
(10*x-25)/2-x = 0
(10*x-25)/2+(2*(-x))/2 = 0
10*x+2*(-x)-25 = 0
8*x-25 = 0
(8*x-25)/2 = 0
(8*x-25)/2 = 0 // * 2
8*x-25 = 0
8*x-25 = 0 // + 25
8*x = 25 // : 8
x = 25/8
x = 25/8
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