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x in (-oo:+oo)
(4/9)*(x-13) = 8 // - 8
(4/9)*(x-13)-8 = 0
4/9*(x-13)-8 = 0
4/9*(x-13)-8 = 0
4/9*x-124/9 = 0
4/9*x-124/9 = 0
4/9*x-124/9 = 0 // + 124/9
4/9*x = 124/9 // : 4/9
x = 124/9/4/9
x = 31
x = 31
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