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Simplifying 21 + 7(12 + y) + -10 = 89 21 + (12 * 7 + y * 7) + -10 = 89 21 + (84 + 7y) + -10 = 89 Reorder the terms: 21 + 84 + -10 + 7y = 89 Combine like terms: 21 + 84 = 105 105 + -10 + 7y = 89 Combine like terms: 105 + -10 = 95 95 + 7y = 89 Solving 95 + 7y = 89 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-95' to each side of the equation. 95 + -95 + 7y = 89 + -95 Combine like terms: 95 + -95 = 0 0 + 7y = 89 + -95 7y = 89 + -95 Combine like terms: 89 + -95 = -6 7y = -6 Divide each side by '7'. y = -0.8571428571 Simplifying y = -0.8571428571
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