Chapter A.4, Problem 4MP

Combine into a single fraction and reduce to lowest terms.

(A)     $\frac{5}{28}-\frac{1}{10}+\frac{6}{35}$

(B)     $\frac{1}{4x^2}-\frac{2x+1}{3x^3}+\frac{3}{12x}$

(C)     $\frac{2}{x^2-4x+4}+\frac{1}{x}-\frac{1}{x-2}$