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Simplifying 21 = 3(y + 2) + -6y Reorder the terms: 21 = 3(2 + y) + -6y 21 = (2 * 3 + y * 3) + -6y 21 = (6 + 3y) + -6y Combine like terms: 3y + -6y = -3y 21 = 6 + -3y Solving 21 = 6 + -3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3y' to each side of the equation. 21 + 3y = 6 + -3y + 3y Combine like terms: -3y + 3y = 0 21 + 3y = 6 + 0 21 + 3y = 6 Add '-21' to each side of the equation. 21 + -21 + 3y = 6 + -21 Combine like terms: 21 + -21 = 0 0 + 3y = 6 + -21 3y = 6 + -21 Combine like terms: 6 + -21 = -15 3y = -15 Divide each side by '3'. y = -5 Simplifying y = -5
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