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x in (-oo:+oo)
(7/4)*x-(5/2) = -8 // + 8
(7/4)*x-(5/2)+8 = 0
(7/4)*x-5/2+8 = 0
7/4*x+11/2 = 0 // - 11/2
7/4*x = -11/2 // : 7/4
x = -11/2/7/4
x = -22/7
x = -22/7
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