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Simplifying 7 + -9[7 + -1(9y + 9)] = 0 Reorder the terms: 7 + -9[7 + -1(9 + 9y)] = 0 7 + -9[7 + (9 * -1 + 9y * -1)] = 0 7 + -9[7 + (-9 + -9y)] = 0 Combine like terms: 7 + -9 = -2 7 + -9[-2 + -9y] = 0 7 + [-2 * -9 + -9y * -9] = 0 7 + [18 + 81y] = 0 Combine like terms: 7 + 18 = 25 25 + 81y = 0 Solving 25 + 81y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 81y = 0 + -25 Combine like terms: 25 + -25 = 0 0 + 81y = 0 + -25 81y = 0 + -25 Combine like terms: 0 + -25 = -25 81y = -25 Divide each side by '81'. y = -0.3086419753 Simplifying y = -0.3086419753
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