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(5/9)*(x-13) = 8*x-(4/7) // - 8*x-(4/7)
(5/9)*(x-13)-(8*x)+4/7 = 0
(5/9)*(x-13)-8*x+4/7 = 0
5/9*(x-13)-8*x+4/7 = 0
(5/9*7*(x-13))/7+(-8*7*x)/7+4/7 = 0
5/9*7*(x-13)-8*7*x+4 = 0
4-469/9*x-455/9 = 0
-469/9*x-419/9 = 0
(-469/9*x-419/9)/7 = 0
(-469/9*x-419/9)/7 = 0 // * 7
-469/9*x-419/9 = 0
-469/9*x-419/9 = 0 // + 419/9
-469/9*x = 419/9 // : -469/9
x = 419/9/(-469/9)
x = -419/469
x = -419/469
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