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1.25*x-9 = 13/4 // - 13/4
1.25*x-(13/4)-9 = 0
1.25*x-13/4-9 = 0
1.25*x-49/4 = 0 // + 49/4
1.25*x = 49/4 // : 1.25
x = 49/4/1.25
x = 9.8
x = 9.8
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