Hi there!
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I believe your answer is:
Distribution property
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Here’s why:
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From the first step to the next step, the 5 gets distributed into the 'x-2'. The distribution property is getting used.
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[tex]5(x-2) = 12x -39\\\\\rightarrow5(x-2)\leftarrow\\\\\left \{ {{5*x=5x} \atop {5*-2=-10}} \right. \\\\\rightarrow5(x-2)=\boxed{5x - 10}\\\\\\5(x - 2) = 12x - 39\\\\\rightarrow\boxed{5x-10}=12x-39[/tex]
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Hope this helps you. I apologize if it’s incorrect.
