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