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a in (-oo:+oo)
a-4*a-(1/2) = -3/4 // + -3/4
a-4*a-(1/2)-(-3/4) = 0
a-4*a-1/2+3/4 = 0
1/4-3*a = 0 // - 1/4
-3*a = -1/4 // : -3
a = -1/4/(-3)
a = 1/12
a = 1/12
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