Vector Algebra

Let $$\overrightarrow a$$ = 2$$\widehat i$$ $$-$$ 3$$\widehat j$$ + 4$$\widehat k$$ and $$\overrightarrow b$$ = 7$$\widehat i$$ + $$\widehat j$$ $$-$$ 6$$\widehat k$$. If $$\overrightarrow r$$ $$\times$$ $$\overrightarrow a$$ = $$\overrightarrow r$$ $$\times$$ $$\overrightarrow b$$, $$\overrightarrow r$$ . ($$\widehat i$$ + 2$$\widehat j$$ + $$\widehat k$$) = $$-$$3, then $$\overrightarrow r$$ . (2$$\widehat i$$ $$-$$ 3$$\widehat j$$ + $$\widehat k$$) is equal to :