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