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a in (-oo:+oo)
(1/4)*a = (1/2)*(3-a)+a-(4/4) // - (1/2)*(3-a)+a-(4/4)
(1/4)*a-((1/2)*(3-a))-a+4/4 = 0
(-1/2)*(3-a)+(1/4)*a-a+4/4 = 0
a/4-1/2*(3-a)-a+1 = 0
(-1/2*4*(3-a))/4+a/4+(4*(-a))/4+(1*4)/4 = 0
a-1/2*4*(3-a)+4*(-a)+1*4 = 0
3*a-4*a-6+4 = 0
4-a-6 = 0
-a-2 = 0
(-a-2)/4 = 0
(-a-2)/4 = 0 // * 4
-a-2 = 0
-a-2 = 0 // + 2
-a = 2 // * -1
a = -2
a = -2
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