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x in (-oo:+oo)
(7/8)*x-(3/4) = 9 // - 9
(7/8)*x-(3/4)-9 = 0
(7/8)*x-3/4-9 = 0
7/8*x-39/4 = 0 // + 39/4
7/8*x = 39/4 // : 7/8
x = 39/4/7/8
x = 78/7
x = 78/7
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