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Simplifying y = (x + -7)(x + 9) Reorder the terms: y = (-7 + x)(x + 9) Reorder the terms: y = (-7 + x)(9 + x) Multiply (-7 + x) * (9 + x) y = (-7(9 + x) + x(9 + x)) y = ((9 * -7 + x * -7) + x(9 + x)) y = ((-63 + -7x) + x(9 + x)) y = (-63 + -7x + (9 * x + x * x)) y = (-63 + -7x + (9x + x2)) Combine like terms: -7x + 9x = 2x y = (-63 + 2x + x2) Solving y = -63 + 2x + x2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Simplifying y = -63 + 2x + x2
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