Add: 5x+1+2x+1\frac{5}{x+1} + \frac{2}{x+1}x+15+x+12
7x+1\frac{7}{x+1}x+17
72x+2\frac{7}{2x+2}2x+27
10(x+1)2\frac{10}{(x+1)^2}(x+1)210
777