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a in (-oo:+oo)
a/4 = 50/40 // - 50/40
a/4-(50/40) = 0
a/4-5/4 = 0
1/4*a-5/4 = 0 // + 5/4
1/4*a = 5/4 // : 1/4
a = 5/4/1/4
a = 5
a = 5
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