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x in (-oo:+oo)
(1/3)*x = 3.5 // - 3.5
(1/3)*x-3.5 = 0
1/3*x-3.5 = 0 // + 3.5
1/3*x = 3.5 // : 1/3
x = 3.5/1/3
x = 10.50000011
x = 10.50000011
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