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Simplifying 12 + -3(7 + X) = 9 12 + (7 * -3 + X * -3) = 9 12 + (-21 + -3X) = 9 Combine like terms: 12 + -21 = -9 -9 + -3X = 9 Solving -9 + -3X = 9 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -3X = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -3X = 9 + 9 -3X = 9 + 9 Combine like terms: 9 + 9 = 18 -3X = 18 Divide each side by '-3'. X = -6 Simplifying X = -6
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