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Simplifying -3(2x + -4) = 3x + 21 + -3x Reorder the terms: -3(-4 + 2x) = 3x + 21 + -3x (-4 * -3 + 2x * -3) = 3x + 21 + -3x (12 + -6x) = 3x + 21 + -3x Reorder the terms: 12 + -6x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 12 + -6x = 21 + 0 12 + -6x = 21 Solving 12 + -6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -6x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -6x = 21 + -12 -6x = 21 + -12 Combine like terms: 21 + -12 = 9 -6x = 9 Divide each side by '-6'. x = -1.5 Simplifying x = -1.5
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