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Simplifying y = (3x + 9)(1 + -1x) + 7x Reorder the terms: y = (9 + 3x)(1 + -1x) + 7x Multiply (9 + 3x) * (1 + -1x) y = (9(1 + -1x) + 3x * (1 + -1x)) + 7x y = ((1 * 9 + -1x * 9) + 3x * (1 + -1x)) + 7x y = ((9 + -9x) + 3x * (1 + -1x)) + 7x y = (9 + -9x + (1 * 3x + -1x * 3x)) + 7x y = (9 + -9x + (3x + -3x2)) + 7x Combine like terms: -9x + 3x = -6x y = (9 + -6x + -3x2) + 7x Reorder the terms: y = 9 + -6x + 7x + -3x2 Combine like terms: -6x + 7x = 1x y = 9 + 1x + -3x2 Solving y = 9 + 1x + -3x2 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Simplifying y = 9 + 1x + -3x2
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