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x in (-oo:+oo)
(1/3)*x = 8.5 // - 8.5
(1/3)*x-8.5 = 0
1/3*x-8.5 = 0 // + 8.5
1/3*x = 8.5 // : 1/3
x = 8.5/1/3
x = 25.50000026
x = 25.50000026
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