\(\frac{7x-4}{5}+x=3+\frac{7-5x}{4}\)
\(\Leftrightarrow\frac{7x-4}{5}-\frac{7-5x}{4}=3-x\)
\(\Leftrightarrow-\frac{\left(7x-4\right).4-\left(7-5x\right).5}{20}=x-3\)
<=> -(28x - 16 - 35 + 25x) = 20.(x - 3)
<=> -(53x - 51) = 20x - 60
<=> -53x + 51 = 20x - 60
<=> 51 + 60 = 20x + 53x
<=> 73x = 111
<=> x = 111/73