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Simplifying 9 = 7y + -13y + -21 Reorder the terms: 9 = -21 + 7y + -13y Combine like terms: 7y + -13y = -6y 9 = -21 + -6y Solving 9 = -21 + -6y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6y' to each side of the equation. 9 + 6y = -21 + -6y + 6y Combine like terms: -6y + 6y = 0 9 + 6y = -21 + 0 9 + 6y = -21 Add '-9' to each side of the equation. 9 + -9 + 6y = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 6y = -21 + -9 6y = -21 + -9 Combine like terms: -21 + -9 = -30 6y = -30 Divide each side by '6'. y = -5 Simplifying y = -5
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