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Simplifying 3y + 21 = 2y + 18 Reorder the terms: 21 + 3y = 2y + 18 Reorder the terms: 21 + 3y = 18 + 2y Solving 21 + 3y = 18 + 2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2y' to each side of the equation. 21 + 3y + -2y = 18 + 2y + -2y Combine like terms: 3y + -2y = 1y 21 + 1y = 18 + 2y + -2y Combine like terms: 2y + -2y = 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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