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x in (-oo:+oo)
(21/8)*x = 3/4 // - 3/4
(21/8)*x-(3/4) = 0
(21/8)*x-3/4 = 0
21/8*x-3/4 = 0 // + 3/4
21/8*x = 3/4 // : 21/8
x = 3/4/21/8
x = 2/7
x = 2/7
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