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a in (-oo:+oo)
(3/4)*a+3 = 117/32 // - 117/32
(3/4)*a-(117/32)+3 = 0
(3/4)*a-117/32+3 = 0
3/4*a-21/32 = 0 // + 21/32
3/4*a = 21/32 // : 3/4
a = 21/32/3/4
a = 7/8
a = 7/8
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