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Simplifying 21 + 6y = 8y + 15 Reorder the terms: 21 + 6y = 15 + 8y Solving 21 + 6y = 15 + 8y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8y' to each side of the equation. 21 + 6y + -8y = 15 + 8y + -8y Combine like terms: 6y + -8y = -2y 21 + -2y = 15 + 8y + -8y Combine like terms: 8y + -8y = 0 21 + -2y = 15 + 0 21 + -2y = 15 Add '-21' to each side of the equation. 21 + -21 + -2y = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -2y = 15 + -21 -2y = 15 + -21 Combine like terms: 15 + -21 = -6 -2y = -6 Divide each side by '-2'. y = 3 Simplifying y = 3
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