`A(6,1), B(8,2) and C(9,4)` are three vertices of a parallelograam ABCd taken in order. Find the fourth vertex D. IF `(x_(1),y_(1)), (x_(2),y_(2)), (x_(3),y_(3)) and (x_(4),y_(4))` are the four vertices of the parallelgraam then using the given points, find the value of `(x_(1)+x_(3)-x_(2),y_(1)+y_(3)+y_(2))` and state the reason for your result.
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