The value of x is 7 by adding all the polynomials, equate it at 24 and do the transposition.
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We have x
lets name the 2nd y
and the 3rd z

first we subtract the excess amount of the other sides from the total lenght
so 24-(1+2)=21
next we divide it by three so we get seven

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thank u po gets ko na.... :)
no problem