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Simplifying -21 = -5x + 2x Combine like terms: -5x + 2x = -3x -21 = -3x Solving -21 = -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -21 + 3x = -3x + 3x Combine like terms: -3x + 3x = 0 -21 + 3x = 0 Add '21' to each side of the equation. -21 + 21 + 3x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 0 + 21 3x = 0 + 21 Combine like terms: 0 + 21 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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