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Simplifying 5x + -21 = -4x Reorder the terms: -21 + 5x = -4x Solving -21 + 5x = -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -21 + 5x + 4x = -4x + 4x Combine like terms: 5x + 4x = 9x -21 + 9x = -4x + 4x Combine like terms: -4x + 4x = 0 -21 + 9x = 0 Add '21' to each side of the equation. -21 + 21 + 9x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 9x = 0 + 21 9x = 0 + 21 Combine like terms: 0 + 21 = 21 9x = 21 Divide each side by '9'. x = 2.333333333 Simplifying x = 2.333333333
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