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Simplifying 21 = y + 13 Reorder the terms: 21 = 13 + y Solving 21 = 13 + 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 = 13 + y + -1y Combine like terms: y + -1y = 0 21 + -1y = 13 + 0 21 + -1y = 13 Add '-21' to each side of the equation. 21 + -21 + -1y = 13 + -21 Combine like terms: 21 + -21 = 0 0 + -1y = 13 + -21 -1y = 13 + -21 Combine like terms: 13 + -21 = -8 -1y = -8 Divide each side by '-1'. y = 8 Simplifying y = 8
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