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Simplifying x + -21 = 5x + 3 Reorder the terms: -21 + x = 5x + 3 Reorder the terms: -21 + x = 3 + 5x Solving -21 + x = 3 + 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 + x + -5x = 3 + 5x + -5x Combine like terms: x + -5x = -4x -21 + -4x = 3 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -4x = 3 + 0 -21 + -4x = 3 Add '21' to each side of the equation. -21 + 21 + -4x = 3 + 21 Combine like terms: -21 + 21 = 0 0 + -4x = 3 + 21 -4x = 3 + 21 Combine like terms: 3 + 21 = 24 -4x = 24 Divide each side by '-4'. x = -6 Simplifying x = -6
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