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Simplifying -21 + -1x = -4x + 21 Reorder the terms: -21 + -1x = 21 + -4x Solving -21 + -1x = 21 + -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 + -1x + 4x = 21 + -4x + 4x Combine like terms: -1x + 4x = 3x -21 + 3x = 21 + -4x + 4x Combine like terms: -4x + 4x = 0 -21 + 3x = 21 + 0 -21 + 3x = 21 Add '21' to each side of the equation. -21 + 21 + 3x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 21 + 21 3x = 21 + 21 Combine like terms: 21 + 21 = 42 3x = 42 Divide each side by '3'. x = 14 Simplifying x = 14
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