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Simplifying 9y + -21 = -42 + 6y Reorder the terms: -21 + 9y = -42 + 6y Solving -21 + 9y = -42 + 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 = -42 + 6y + -6y Combine like terms: 9y + -6y = 3y -21 + 3y = -42 + 6y + -6y Combine like terms: 6y + -6y = 0 -21 + 3y = -42 + 0 -21 + 3y = -42 Add '21' to each side of the equation. -21 + 21 + 3y = -42 + 21 Combine like terms: -21 + 21 = 0 0 + 3y = -42 + 21 3y = -42 + 21 Combine like terms: -42 + 21 = -21 3y = -21 Divide each side by '3'. y = -7 Simplifying y = -7
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