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Simplifying -21 = 5x + 3x + -5 Reorder the terms: -21 = -5 + 5x + 3x Combine like terms: 5x + 3x = 8x -21 = -5 + 8x Solving -21 = -5 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. -21 + -8x = -5 + 8x + -8x Combine like terms: 8x + -8x = 0 -21 + -8x = -5 + 0 -21 + -8x = -5 Add '21' to each side of the equation. -21 + 21 + -8x = -5 + 21 Combine like terms: -21 + 21 = 0 0 + -8x = -5 + 21 -8x = -5 + 21 Combine like terms: -5 + 21 = 16 -8x = 16 Divide each side by '-8'. x = -2 Simplifying x = -2
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