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