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Simplifying 2y + 21 = 9y + 7 Reorder the terms: 21 + 2y = 9y + 7 Reorder the terms: 21 + 2y = 7 + 9y Solving 21 + 2y = 7 + 9y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9y' to each side of the equation. 21 + 2y + -9y = 7 + 9y + -9y Combine like terms: 2y + -9y = -7y 21 + -7y = 7 + 9y + -9y Combine like terms: 9y + -9y = 0 21 + -7y = 7 + 0 21 + -7y = 7 Add '-21' to each side of the equation. 21 + -21 + -7y = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -7y = 7 + -21 -7y = 7 + -21 Combine like terms: 7 + -21 = -14 -7y = -14 Divide each side by '-7'. y = 2 Simplifying y = 2
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