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Simplifying -3(x + 3) + 4x = 12 Reorder the terms: -3(3 + x) + 4x = 12 (3 * -3 + x * -3) + 4x = 12 (-9 + -3x) + 4x = 12 Combine like terms: -3x + 4x = 1x -9 + 1x = 12 Solving -9 + 1x = 12 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 + 1x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 1x = 12 + 9 1x = 12 + 9 Combine like terms: 12 + 9 = 21 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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