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Simplifying -21 = 2(x + -8) + 3x Reorder the terms: -21 = 2(-8 + x) + 3x -21 = (-8 * 2 + x * 2) + 3x -21 = (-16 + 2x) + 3x Combine like terms: 2x + 3x = 5x -21 = -16 + 5x Solving -21 = -16 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -21 + -5x = -16 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -5x = -16 + 0 -21 + -5x = -16 Add '21' to each side of the equation. -21 + 21 + -5x = -16 + 21 Combine like terms: -21 + 21 = 0 0 + -5x = -16 + 21 -5x = -16 + 21 Combine like terms: -16 + 21 = 5 -5x = 5 Divide each side by '-5'. x = -1 Simplifying x = -1
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