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Simplifying y = (x + 3)(x + 7) Reorder the terms: y = (3 + x)(x + 7) Reorder the terms: y = (3 + x)(7 + x) Multiply (3 + x) * (7 + x) y = (3(7 + x) + x(7 + x)) y = ((7 * 3 + x * 3) + x(7 + x)) y = ((21 + 3x) + x(7 + x)) y = (21 + 3x + (7 * x + x * x)) y = (21 + 3x + (7x + x2)) Combine like terms: 3x + 7x = 10x y = (21 + 10x + x2) Solving y = 21 + 10x + x2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Simplifying y = 21 + 10x + x2
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