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Simplifying 8y + 7 = y + 21 Reorder the terms: 7 + 8y = y + 21 Reorder the terms: 7 + 8y = 21 + y Solving 7 + 8y = 21 + 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. 7 + 8y + -1y = 21 + y + -1y Combine like terms: 8y + -1y = 7y 7 + 7y = 21 + y + -1y Combine like terms: y + -1y = 0 7 + 7y = 21 + 0 7 + 7y = 21 Add '-7' to each side of the equation. 7 + -7 + 7y = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 7y = 21 + -7 7y = 21 + -7 Combine like terms: 21 + -7 = 14 7y = 14 Divide each side by '7'. y = 2 Simplifying y = 2
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