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Simplifying 2x + -3(7 + -3x) = 12 2x + (7 * -3 + -3x * -3) = 12 2x + (-21 + 9x) = 12 Reorder the terms: -21 + 2x + 9x = 12 Combine like terms: 2x + 9x = 11x -21 + 11x = 12 Solving -21 + 11x = 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 + 11x = 12 + 21 Combine like terms: -21 + 21 = 0 0 + 11x = 12 + 21 11x = 12 + 21 Combine like terms: 12 + 21 = 33 11x = 33 Divide each side by '11'. x = 3 Simplifying x = 3
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