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Simplifying 7(y + -9) = 21 Reorder the terms: 7(-9 + y) = 21 (-9 * 7 + y * 7) = 21 (-63 + 7y) = 21 Solving -63 + 7y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 7y = 21 + 63 Combine like terms: -63 + 63 = 0 0 + 7y = 21 + 63 7y = 21 + 63 Combine like terms: 21 + 63 = 84 7y = 84 Divide each side by '7'. y = 12 Simplifying y = 12
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