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Okay, this looks like a classic system of equations problem, one quadratic and one linear. The initial setup with x² + y² = 20 and x - y = 6 is standard, and isolating x from the linear equation seems like the logical first move.

Yep, isolating x as 6 + y is exactly what I expected. Now they're setting up the substitution, which is the key step to turn this into a single-variable problem. Curious to see how this expansion plays out.

Alright, they're plugging in (6 + y) for x into the first equation. This is where it gets interesting – squaring that binomial is going to be the next hurdle. Hope they handle the expansion carefully.

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The problem begins by presenting two equations: x² + y² = 20 (Equation 1) and x - y = 6 (Equation 2) [0:00]. The initial step involves isolating one variable from the second equation, here solved by expressing x in terms of y, yielding x = 6 + y (Equation 3) [0:10]. This rearranged equation is then prepared for substitution into the first equation.

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