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Simplifying 9(x + -1) + -4x = 21 Reorder the terms: 9(-1 + x) + -4x = 21 (-1 * 9 + x * 9) + -4x = 21 (-9 + 9x) + -4x = 21 Combine like terms: 9x + -4x = 5x -9 + 5x = 21 Solving -9 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 5x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 5x = 21 + 9 5x = 21 + 9 Combine like terms: 21 + 9 = 30 5x = 30 Divide each side by '5'. x = 6 Simplifying x = 6
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