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x in (-oo:+oo)
(6.5/3)*x+5 = 11.5 // - 11.5
(6.5/3)*x-11.5+5 = 0
2.16666667*x-6.5 = 0 // + 6.5
2.16666667*x = 6.5 // : 2.16666667
x = 6.5/2.16666667
x = 3
x = 3
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