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Simplifying -9y + 21 = 6y + -9 Reorder the terms: 21 + -9y = 6y + -9 Reorder the terms: 21 + -9y = -9 + 6y Solving 21 + -9y = -9 + 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. 21 + -9y + -6y = -9 + 6y + -6y Combine like terms: -9y + -6y = -15y 21 + -15y = -9 + 6y + -6y Combine like terms: 6y + -6y = 0 21 + -15y = -9 + 0 21 + -15y = -9 Add '-21' to each side of the equation. 21 + -21 + -15y = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -15y = -9 + -21 -15y = -9 + -21 Combine like terms: -9 + -21 = -30 -15y = -30 Divide each side by '-15'. y = 2 Simplifying y = 2
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