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a in (-oo:+oo)
(1/4)*a-(12/8) = 4 // - 4
(1/4)*a-(12/8)-4 = 0
(1/4)*a-3/2-4 = 0
1/4*a-11/2 = 0 // + 11/2
1/4*a = 11/2 // : 1/4
a = 11/2/1/4
a = 22
a = 22
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