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Simplifying -21 = -3(y + 9) Reorder the terms: -21 = -3(9 + y) -21 = (9 * -3 + y * -3) -21 = (-27 + -3y) Solving -21 = -27 + -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 = -27 + -3y + 3y Combine like terms: -3y + 3y = 0 -21 + 3y = -27 + 0 -21 + 3y = -27 Add '21' to each side of the equation. -21 + 21 + 3y = -27 + 21 Combine like terms: -21 + 21 = 0 0 + 3y = -27 + 21 3y = -27 + 21 Combine like terms: -27 + 21 = -6 3y = -6 Divide each side by '3'. y = -2 Simplifying y = -2
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