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Simplifying -12x + -9x = 7x + 20 Combine like terms: -12x + -9x = -21x -21x = 7x + 20 Reorder the terms: -21x = 20 + 7x Solving -21x = 20 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -21x + -7x = 20 + 7x + -7x Combine like terms: -21x + -7x = -28x -28x = 20 + 7x + -7x Combine like terms: 7x + -7x = 0 -28x = 20 + 0 -28x = 20 Divide each side by '-28'. x = -0.7142857143 Simplifying x = -0.7142857143
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