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a in (-oo:+oo)
(3/8)*a = 1/4+4 // - 1/4+4
(3/8)*a-(1/4)-4 = 0
(3/8)*a-1/4-4 = 0
3/8*a-17/4 = 0 // + 17/4
3/8*a = 17/4 // : 3/8
a = 17/4/3/8
a = 34/3
a = 34/3
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