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Simplifying 3(X + -7) = 3(3 + -9n) Reorder the terms: 3(-7 + X) = 3(3 + -9n) (-7 * 3 + X * 3) = 3(3 + -9n) (-21 + 3X) = 3(3 + -9n) -21 + 3X = (3 * 3 + -9n * 3) -21 + 3X = (9 + -27n) Solving -21 + 3X = 9 + -27n Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3X = 9 + 21 + -27n Combine like terms: -21 + 21 = 0 0 + 3X = 9 + 21 + -27n 3X = 9 + 21 + -27n Combine like terms: 9 + 21 = 30 3X = 30 + -27n Divide each side by '3'. X = 10 + -9n Simplifying X = 10 + -9n
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