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2*x-(5/2) = 10 // - 10
2*x-(5/2)-10 = 0
2*x-5/2-10 = 0
2*x-25/2 = 0 // + 25/2
2*x = 25/2 // : 2
x = 25/2/2
x = 25/4
x = 25/4
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