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Simplifying 9x + -3(7 + 2x) = -12 9x + (7 * -3 + 2x * -3) = -12 9x + (-21 + -6x) = -12 Reorder the terms: -21 + 9x + -6x = -12 Combine like terms: 9x + -6x = 3x -21 + 3x = -12 Solving -21 + 3x = -12 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 = -12 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = -12 + 21 3x = -12 + 21 Combine like terms: -12 + 21 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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