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a in (-oo:+oo)
1.25*(a-9) = 13/4 // - 13/4
1.25*(a-9)-(13/4) = 0
1.25*(a-9)-13/4 = 0
(1.25*4*(a-9))/4-13/4 = 0
1.25*4*(a-9)-13 = 0
5*a-58 = 0
(5*a-58)/4 = 0
(5*a-58)/4 = 0 // * 4
5*a-58 = 0
5*a-58 = 0 // + 58
5*a = 58 // : 5
a = 58/5
a = 58/5
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