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Simplifying 21 = 2y + 7 Reorder the terms: 21 = 7 + 2y Solving 21 = 7 + 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 + -2y = 7 + 2y + -2y Combine like terms: 2y + -2y = 0 21 + -2y = 7 + 0 21 + -2y = 7 Add '-21' to each side of the equation. 21 + -21 + -2y = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2y = 7 + -21 -2y = 7 + -21 Combine like terms: 7 + -21 = -14 -2y = -14 Divide each side by '-2'. y = 7 Simplifying y = 7
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