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Simplifying 3 + 7x = -5x + -129 Reorder the terms: 3 + 7x = -129 + -5x Solving 3 + 7x = -129 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 3 + 7x + 5x = -129 + -5x + 5x Combine like terms: 7x + 5x = 12x 3 + 12x = -129 + -5x + 5x Combine like terms: -5x + 5x = 0 3 + 12x = -129 + 0 3 + 12x = -129 Add '-3' to each side of the equation. 3 + -3 + 12x = -129 + -3 Combine like terms: 3 + -3 = 0 0 + 12x = -129 + -3 12x = -129 + -3 Combine like terms: -129 + -3 = -132 12x = -132 Divide each side by '12'. x = -11 Simplifying x = -11
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