а) $$9\frac{16}{51}+2x=4\frac{11}{34}$$

$$9\frac{16}{51}+2x=4\frac{11}{34}$$ $$2x=4\frac{11}{34}-9\frac{16}{51}$$ $$2x=\frac{147}{34}-\frac{475}{51}$$ $$2x=\frac{441-950}{102}$$ $$2x=\frac{-509}{102}$$ $$x=\frac{-509}{102}:2$$ $$x=\frac{-509}{102} \cdot \frac{1}{2}$$ $$x=\frac{-509}{204}$$ $$x=-2\frac{101}{204}$$ Ответ: $$x=-2\frac{101}{204}$$