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(9/2)*x-(5/2) = 13/2 // - 13/2
(9/2)*x-(5/2)-(13/2) = 0
(9/2)*x-5/2-13/2 = 0
9/2*x-9 = 0 // + 9
9/2*x = 9 // : 9/2
x = 9/9/2
x = 2
x = 2
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