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Simplifying -6x + -84 + -9x = 51 Reorder the terms: -84 + -6x + -9x = 51 Combine like terms: -6x + -9x = -15x -84 + -15x = 51 Solving -84 + -15x = 51 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + -15x = 51 + 84 Combine like terms: -84 + 84 = 0 0 + -15x = 51 + 84 -15x = 51 + 84 Combine like terms: 51 + 84 = 135 -15x = 135 Divide each side by '-15'. x = -9 Simplifying x = -9
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