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Simplifying 28 = y + 21 Reorder the terms: 28 = 21 + y Solving 28 = 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. 28 + -1y = 21 + y + -1y Combine like terms: y + -1y = 0 28 + -1y = 21 + 0 28 + -1y = 21 Add '-28' to each side of the equation. 28 + -28 + -1y = 21 + -28 Combine like terms: 28 + -28 = 0 0 + -1y = 21 + -28 -1y = 21 + -28 Combine like terms: 21 + -28 = -7 -1y = -7 Divide each side by '-1'. y = 7 Simplifying y = 7
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