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(3*x+13)/5+(x+20)/4 = 11 // - 11
(3*x+13)/5+(x+20)/4-11 = 0
(4*(3*x+13))/(4*5)+(5*(x+20))/(4*5)+(-11*4*5)/(4*5) = 0
4*(3*x+13)+5*(x+20)-11*4*5 = 0
17*x-220+152 = 0
17*x-68 = 0
(17*x-68)/(4*5) = 0
(17*x-68)/(4*5) = 0 // * 4*5
17*x-68 = 0
17*x-68 = 0 // + 68
17*x = 68 // : 17
x = 68/17
x = 4
x = 4
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