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Simplifying 3 = y + 21 Reorder the terms: 3 = 21 + y Solving 3 = 21 + 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. 3 + -1y = 21 + y + -1y Combine like terms: y + -1y = 0 3 + -1y = 21 + 0 3 + -1y = 21 Add '-3' to each side of the equation. 3 + -3 + -1y = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -1y = 21 + -3 -1y = 21 + -3 Combine like terms: 21 + -3 = 18 -1y = 18 Divide each side by '-1'. y = -18 Simplifying y = -18
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