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Simplifying 8x + -21 + -5x = -12 Reorder the terms: -21 + 8x + -5x = -12 Combine like terms: 8x + -5x = 3x -21 + 3x = -12 Solving -21 + 3x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = -12 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = -12 + 21 3x = -12 + 21 Combine like terms: -12 + 21 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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