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Simplifying 3x + -21 = -3 + x Reorder the terms: -21 + 3x = -3 + x Solving -21 + 3x = -3 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -21 + 3x + -1x = -3 + x + -1x Combine like terms: 3x + -1x = 2x -21 + 2x = -3 + x + -1x Combine like terms: x + -1x = 0 -21 + 2x = -3 + 0 -21 + 2x = -3 Add '21' to each side of the equation. -21 + 21 + 2x = -3 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = -3 + 21 2x = -3 + 21 Combine like terms: -3 + 21 = 18 2x = 18 Divide each side by '2'. x = 9 Simplifying x = 9
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