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Simplifying 7y + 7(y + 3) = -21 Reorder the terms: 7y + 7(3 + y) = -21 7y + (3 * 7 + y * 7) = -21 7y + (21 + 7y) = -21 Reorder the terms: 21 + 7y + 7y = -21 Combine like terms: 7y + 7y = 14y 21 + 14y = -21 Solving 21 + 14y = -21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 14y = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 14y = -21 + -21 14y = -21 + -21 Combine like terms: -21 + -21 = -42 14y = -42 Divide each side by '14'. y = -3 Simplifying y = -3
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