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