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Simplifying 18 + -1y + 2 = 21 Reorder the terms: 18 + 2 + -1y = 21 Combine like terms: 18 + 2 = 20 20 + -1y = 21 Solving 20 + -1y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1y = 21 + -20 Combine like terms: 20 + -20 = 0 0 + -1y = 21 + -20 -1y = 21 + -20 Combine like terms: 21 + -20 = 1 -1y = 1 Divide each side by '-1'. y = -1 Simplifying y = -1
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