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a in (-oo:+oo)
(1/4)*a-(1/4) = -4 // + 4
(1/4)*a-(1/4)+4 = 0
(1/4)*a-1/4+4 = 0
1/4*a+15/4 = 0 // - 15/4
1/4*a = -15/4 // : 1/4
a = -15/4/1/4
a = -15
a = -15
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