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Simplifying 8y + -21 = y Reorder the terms: -21 + 8y = y Solving -21 + 8y = 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 + 8y + -1y = y + -1y Combine like terms: 8y + -1y = 7y -21 + 7y = y + -1y Combine like terms: y + -1y = 0 -21 + 7y = 0 Add '21' to each side of the equation. -21 + 21 + 7y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 7y = 0 + 21 7y = 0 + 21 Combine like terms: 0 + 21 = 21 7y = 21 Divide each side by '7'. y = 3 Simplifying y = 3
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