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a in (-oo:+oo)
(1/4)*a-(1/4) = -3 // + 3
(1/4)*a-(1/4)+3 = 0
(1/4)*a-1/4+3 = 0
1/4*a+11/4 = 0 // - 11/4
1/4*a = -11/4 // : 1/4
a = -11/4/1/4
a = -11
a = -11
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