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Simplifying -2x + -21 = -4x + 7 Reorder the terms: -21 + -2x = -4x + 7 Reorder the terms: -21 + -2x = 7 + -4x Solving -21 + -2x = 7 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -21 + -2x + 4x = 7 + -4x + 4x Combine like terms: -2x + 4x = 2x -21 + 2x = 7 + -4x + 4x Combine like terms: -4x + 4x = 0 -21 + 2x = 7 + 0 -21 + 2x = 7 Add '21' to each side of the equation. -21 + 21 + 2x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 7 + 21 2x = 7 + 21 Combine like terms: 7 + 21 = 28 2x = 28 Divide each side by '2'. x = 14 Simplifying x = 14
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