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x in (-oo:+oo)
(31/2)*x+13.5 = 17.7 // - 17.7
(31/2)*x-17.7+13.5 = 0
31/2*x-4.2 = 0 // + 4.2
31/2*x = 4.2 // : 31/2
x = 4.2/31/2
x = 0.27096774
x = 0.27096774
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