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(5/2)*(x-1) = 5 // - 5
(5/2)*(x-1)-5 = 0
5/2*(x-1)-5 = 0
5/2*(x-1)-5 = 0
5/2*x-15/2 = 0
5/2*x-15/2 = 0
5/2*x-15/2 = 0 // + 15/2
5/2*x = 15/2 // : 5/2
x = 15/2/5/2
x = 3
x = 3
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