(a) If $y=(2x+3{)}^7+\frac{x+1}{2x-1}$, find the value of $\frac{\mathrm{d}y}{\mathrm{d}x}$ at x = -1.
(b) Using the substitution, $u=x+2$, evaluate ${\int }_1^2\frac{x-1}{(x+2{)}^4}\mathrm{d}x$.


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