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Simplifying 21 = 3(y + 3) + -7y Reorder the terms: 21 = 3(3 + y) + -7y 21 = (3 * 3 + y * 3) + -7y 21 = (9 + 3y) + -7y Combine like terms: 3y + -7y = -4y 21 = 9 + -4y Solving 21 = 9 + -4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4y' to each side of the equation. 21 + 4y = 9 + -4y + 4y Combine like terms: -4y + 4y = 0 21 + 4y = 9 + 0 21 + 4y = 9 Add '-21' to each side of the equation. 21 + -21 + 4y = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 4y = 9 + -21 4y = 9 + -21 Combine like terms: 9 + -21 = -12 4y = -12 Divide each side by '4'. y = -3 Simplifying y = -3
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