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x in (-oo:+oo)
(5/3)*x = 7.5 // - 7.5
(5/3)*x-7.5 = 0
5/3*x-7.5 = 0 // + 7.5
5/3*x = 7.5 // : 5/3
x = 7.5/5/3
x = 4.49999999
x = 4.49999999
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