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Simplifying -3x + -6(-3x + 9) = 126 Reorder the terms: -3x + -6(9 + -3x) = 126 -3x + (9 * -6 + -3x * -6) = 126 -3x + (-54 + 18x) = 126 Reorder the terms: -54 + -3x + 18x = 126 Combine like terms: -3x + 18x = 15x -54 + 15x = 126 Solving -54 + 15x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '54' to each side of the equation. -54 + 54 + 15x = 126 + 54 Combine like terms: -54 + 54 = 0 0 + 15x = 126 + 54 15x = 126 + 54 Combine like terms: 126 + 54 = 180 15x = 180 Divide each side by '15'. x = 12 Simplifying x = 12
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