What is the measurement of side KL in a scalene triangle

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Given: $\triangle FGH\cong \triangle JKL$

What is the measure of side 2 on triangle 2?

Here is what I have.

Triangle 1:

Side 1: Unknown

Side 2: Unknown

Side 3: 12

Triangle 2:

Side 1: Unknown

Side 2: y

Side 3 : 3y-15

Can you help?

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You'd have, since triangles are congruent

Side 3 (FGH) = Side 3 (JKL)

$3y-15=12$