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(5*x+9)/45 = 90 // - 90
(5*x+9)/45-90 = 0
(5*x+9)/45+(-90*45)/45 = 0
5*x-90*45+9 = 0
5*x-4041 = 0
(5*x-4041)/45 = 0
(5*x-4041)/45 = 0 // * 45
5*x-4041 = 0
5*x-4041 = 0 // + 4041
5*x = 4041 // : 5
x = 4041/5
x = 4041/5
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