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x in (-oo:+oo)
(8/3)*x = 8.5 // - 8.5
(8/3)*x-8.5 = 0
8/3*x-8.5 = 0 // + 8.5
8/3*x = 8.5 // : 8/3
x = 8.5/8/3
x = 3.1875
x = 3.1875
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