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