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If 3(x - y)= 27 and 3(x + y) = 243, then x is equal to:

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6
Explanation:

3(x - y)= 27=33 $\Leftrightarrow $x - y = 3 ....(i)

3(x + y) = 243=35 $\Leftrightarrow$ x + y = 5 ....(ii)

On solving (i) and (ii), we get x = 4.

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