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a in (-oo:+oo)
a/2.5 = 13/10 // - 13/10
a/2.5-(13/10) = 0
a/2.5-13/10 = 0
0.4*a-13/10 = 0 // + 13/10
0.4*a = 13/10 // : 0.4
a = 13/10/0.4
a = 3.25
a = 3.25
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