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x in (-oo:+oo)
(2/3)*x = 15.6 // - 15.6
(2/3)*x-15.6 = 0
2/3*x-15.6 = 0 // + 15.6
2/3*x = 15.6 // : 2/3
x = 15.6/2/3
x = 23.39999988
x = 23.39999988
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