Tìm x, biết:
a) \(\dfrac{x+1}{5}\) + \(\dfrac{x+3}{4}\) = \(\dfrac{x+5}{3}\) + \(\dfrac{x+7}{2}\)
b) \(\dfrac{3}{\left(x+2\right)\left(x+5\right)}\) + \(\dfrac{5}{\left(x+5\right)\left(x+10\right)}\) + \(\dfrac{7}{\left(x+10\right)\left(x+17\right)}\) = \(\dfrac{x}{\left(x+2\right)\left(x+17\right)}\)
Giải chi tiết cho mk cả hai phần nha!