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a in (-oo:+oo)
a/4+2 = 3/5 // - 3/5
a/4-(3/5)+2 = 0
a/4-3/5+2 = 0
1/4*a+7/5 = 0 // - 7/5
1/4*a = -7/5 // : 1/4
a = -7/5/1/4
a = -28/5
a = -28/5
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