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a in (-oo:+oo)
(3/4)*a-(7/8) = 17/8 // - 17/8
(3/4)*a-(7/8)-(17/8) = 0
(3/4)*a-7/8-17/8 = 0
3/4*a-3 = 0 // + 3
3/4*a = 3 // : 3/4
a = 3/3/4
a = 4
a = 4
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