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x in (-oo:+oo)
(2*x+1)/(1/3)+(x-1)/4 = 13/2 // - 13/2
(2*x+1)/(1/3)+(x-1)/4-(13/2) = 0
(2*x+1)/(1/3)+(x-1)/4-13/2 = 0
(2*x+1)/1/3+(x-1)/4-13/2 = 0
(2*4*(2*x+1))/(1/3*2*4)+(1/3*2*(x-1))/(1/3*2*4)+(-13*1/3*4)/(1/3*2*4) = 0
2*4*(2*x+1)+1/3*2*(x-1)-13*1/3*4 = 0
50/3*x-52/3+22/3 = 0
50/3*x-10 = 0
(50/3*x-10)/(1/3*2*4) = 0
(50/3*x-10)/(1/3*2*4) = 0 // * 1/3*2*4
50/3*x-10 = 0
50/3*x-10 = 0 // + 10
50/3*x = 10 // : 50/3
x = 10/50/3
x = 3/5
x = 3/5
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