63 of course !
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I think it is 21?
(21-3)times(7+4)
Answer: 21 feet. This is because if you multiply 3 feet in a yard times 7 yards, you get 21 feet.
2x-3=10x+21 2x-3-2x=10x+21-2x -3=8x+21 -3-21=8x+21-21 -24=8x -3=x
divide 45 by 5 and multiply by 3 45 divided by 5 is 7 times 3 is 21.