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Simplifying -9x + -54 + 4x = 21 Reorder the terms: -54 + -9x + 4x = 21 Combine like terms: -9x + 4x = -5x -54 + -5x = 21 Solving -54 + -5x = 21 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 + -5x = 21 + 54 Combine like terms: -54 + 54 = 0 0 + -5x = 21 + 54 -5x = 21 + 54 Combine like terms: 21 + 54 = 75 -5x = 75 Divide each side by '-5'. x = -15 Simplifying x = -15
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