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Simplifying -3y + 9 = 21 Reorder the terms: 9 + -3y = 21 Solving 9 + -3y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -3y = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -3y = 21 + -9 -3y = 21 + -9 Combine like terms: 21 + -9 = 12 -3y = 12 Divide each side by '-3'. y = -4 Simplifying y = -4
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