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x = 3

y = 9

Step-by-step explanation:

   →  ( 1 )

3x = y   →  ( 2 )

x + y = 12 → ( 3 )

Let us solve.

x + y = 12

x + 3x = 12

4x = 12

Divide both sides by 4.

x = 3

Let us take equation ( 2 )

3x = y

3 × 3 = y

9 = y

Hope this helps you :-)

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