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Simplifying 7 + 21 = 3y + -3 Combine like terms: 7 + 21 = 28 28 = 3y + -3 Reorder the terms: 28 = -3 + 3y Solving 28 = -3 + 3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3y' to each side of the equation. 28 + -3y = -3 + 3y + -3y Combine like terms: 3y + -3y = 0 28 + -3y = -3 + 0 28 + -3y = -3 Add '-28' to each side of the equation. 28 + -28 + -3y = -3 + -28 Combine like terms: 28 + -28 = 0 0 + -3y = -3 + -28 -3y = -3 + -28 Combine like terms: -3 + -28 = -31 -3y = -31 Divide each side by '-3'. y = 10.33333333 Simplifying y = 10.33333333
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