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a in (-oo:+oo)
a/4-((3*a-1)/16) = 0
(-1*(3*a-1))/16+a/4 = 0
(-1*4*(3*a-1))/(4*16)+(16*a)/(4*16) = 0
16*a-1*4*(3*a-1) = 0
4*a+4 = 0
(4*a+4)/(4*16) = 0
(4*a+4)/(4*16) = 0 // * 4*16
4*a+4 = 0
4*a+4 = 0 // - 4
4*a = -4 // : 4
a = -4/4
a = -1
a = -1
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