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Simplifying -21 = 2(x + -8) + -7x Reorder the terms: -21 = 2(-8 + x) + -7x -21 = (-8 * 2 + x * 2) + -7x -21 = (-16 + 2x) + -7x Combine like terms: 2x + -7x = -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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