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Simplifying 3(4x + -7) = -129 Reorder the terms: 3(-7 + 4x) = -129 (-7 * 3 + 4x * 3) = -129 (-21 + 12x) = -129 Solving -21 + 12x = -129 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 + 12x = -129 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = -129 + 21 12x = -129 + 21 Combine like terms: -129 + 21 = -108 12x = -108 Divide each side by '12'. x = -9 Simplifying x = -9
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