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k in (-oo:+oo)
(7*k+3)/4 = (8*k-1)/5+2 // - (8*k-1)/5+2
(7*k+3)/4-((8*k-1)/5)-2 = 0
(7*k+3)/4+(-1*(8*k-1))/5-2 = 0
(5*(7*k+3))/(4*5)+(-1*4*(8*k-1))/(4*5)+(-2*4*5)/(4*5) = 0
5*(7*k+3)-1*4*(8*k-1)-2*4*5 = 0
3*k-40+19 = 0
3*k-21 = 0
(3*k-21)/(4*5) = 0
(3*k-21)/(4*5) = 0 // * 4*5
3*k-21 = 0
3*k-21 = 0 // + 21
3*k = 21 // : 3
k = 21/3
k = 7
k = 7
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