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Omni-MATH / HOW,BOW, and DAH are equilateral triangles in a plane such that WO=7 and AH=2. Given that D,A,B are collinear in that order, find the length of BA.

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problem

HOW,BOWH O W, B O W, and DAHD A H are equilateral triangles in a plane such that WO=7W O=7 and AH=2A H=2. Given that D,A,BD, A, B are collinear in that order, find the length of BAB A.
Plain-text mathematical notation (without MathML)
HOW,BOW, and DAH are equilateral triangles in a plane such that WO=7 and AH=2. Given that D,A,B are collinear in that order, find the length of BA.
Original LaTeX notation
$H O W, B O W$, and $D A H$ are equilateral triangles in a plane such that $W O=7$ and $A H=2$. Given that $D, A, B$ are collinear in that order, find the length of $B A$.

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