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5*x-(5/2) = 4 // - 4
5*x-(5/2)-4 = 0
5*x-5/2-4 = 0
5*x-13/2 = 0 // + 13/2
5*x = 13/2 // : 5
x = 13/2/5
x = 13/10
x = 13/10
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