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Simplifying 21 = y + 18 Reorder the terms: 21 = 18 + y Solving 21 = 18 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. 21 + -1y = 18 + y + -1y Combine like terms: y + -1y = 0 21 + -1y = 18 + 0 21 + -1y = 18 Add '-21' to each side of the equation. 21 + -21 + -1y = 18 + -21 Combine like terms: 21 + -21 = 0 0 + -1y = 18 + -21 -1y = 18 + -21 Combine like terms: 18 + -21 = -3 -1y = -3 Divide each side by '-1'. y = 3 Simplifying y = 3
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