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HELP! NEED EXPLANATION FOR UNDERSTANDING A STEP IN THIS EQUATION

I understand steps 1 and 2 but then in step 2 i don't see how the 6 and 3 cross out and form a 2

HELP NEED EXPLANATION FOR UNDERSTANDING A STEP IN THIS EQUATION I understand steps 1 and 2 but then in step 2 i dont see how the 6 and 3 cross out and form a 2 class=

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They drop the parenthesis then they added the 2 equations in the numerator the divided the sum of two bye the denominator

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