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a in (-oo:+oo)
(-1/4)*a = 3/8 // - 3/8
(-1/4)*a-(3/8) = 0
(-1/4)*a-3/8 = 0
-1/4*a-3/8 = 0 // + 3/8
-1/4*a = 3/8 // : -1/4
a = 3/8/(-1/4)
a = -3/2
a = -3/2
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