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a in (-oo:+oo)
a/4-(1/4) = -5 // + 5
a/4-(1/4)+5 = 0
a/4-1/4+5 = 0
1/4*a+19/4 = 0 // - 19/4
1/4*a = -19/4 // : 1/4
a = -19/4/1/4
a = -19
a = -19
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