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Simplifying y = (x + 9)(x + -1) Reorder the terms: y = (9 + x)(x + -1) Reorder the terms: y = (9 + x)(-1 + x) Multiply (9 + x) * (-1 + x) y = (9(-1 + x) + x(-1 + x)) y = ((-1 * 9 + x * 9) + x(-1 + x)) y = ((-9 + 9x) + x(-1 + x)) y = (-9 + 9x + (-1 * x + x * x)) y = (-9 + 9x + (-1x + x2)) Combine like terms: 9x + -1x = 8x y = (-9 + 8x + x2) Solving y = -9 + 8x + x2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Simplifying y = -9 + 8x + x2
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