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Simplifying -6x + 3(6x + -15) = -129 Reorder the terms: -6x + 3(-15 + 6x) = -129 -6x + (-15 * 3 + 6x * 3) = -129 -6x + (-45 + 18x) = -129 Reorder the terms: -45 + -6x + 18x = -129 Combine like terms: -6x + 18x = 12x -45 + 12x = -129 Solving -45 + 12x = -129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + 12x = -129 + 45 Combine like terms: -45 + 45 = 0 0 + 12x = -129 + 45 12x = -129 + 45 Combine like terms: -129 + 45 = -84 12x = -84 Divide each side by '12'. x = -7 Simplifying x = -7
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