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(4*x+6)/13 = x-3 // - x-3
(4*x+6)/13-x+3 = 0
(4*x+6)/13+(13*(-x))/13+(3*13)/13 = 0
4*x+13*(-x)+3*13+6 = 0
6-9*x+39 = 0
45-9*x = 0
(45-9*x)/13 = 0
(45-9*x)/13 = 0 // * 13
45-9*x = 0
45-9*x = 0 // - 45
-9*x = -45 // : -9
x = -45/(-9)
x = 5
x = 5
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