exam Maths Puzzle Numerical Ability

A rectangular box is(3x+7) feet wide, (6x + 3) feet long, and (7x-1)feet high.
Find the volume of this box./
Please help me with this one,I tried to do it.
V=LWH

V=(6x+3)(3x+7)(7x-1)
126x-21
Thank you

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