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a in (-oo:+oo)
(3/4)*a-8 = -137/16 // + -137/16
(3/4)*a-(-137/16)-8 = 0
(3/4)*a+137/16-8 = 0
3/4*a+9/16 = 0 // - 9/16
3/4*a = -9/16 // : 3/4
a = -9/16/3/4
a = -3/4
a = -3/4
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