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a in (-oo:+oo)
(3/8)*a-4 = -1/4 // + -1/4
(3/8)*a-(-1/4)-4 = 0
(3/8)*a+1/4-4 = 0
3/8*a-15/4 = 0 // + 15/4
3/8*a = 15/4 // : 3/8
a = 15/4/3/8
a = 10
a = 10
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