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Simplifying 3x + -3 = x + -21 Reorder the terms: -3 + 3x = x + -21 Reorder the terms: -3 + 3x = -21 + x Solving -3 + 3x = -21 + 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. -3 + 3x + -1x = -21 + x + -1x Combine like terms: 3x + -1x = 2x -3 + 2x = -21 + x + -1x Combine like terms: x + -1x = 0 -3 + 2x = -21 + 0 -3 + 2x = -21 Add '3' to each side of the equation. -3 + 3 + 2x = -21 + 3 Combine like terms: -3 + 3 = 0 0 + 2x = -21 + 3 2x = -21 + 3 Combine like terms: -21 + 3 = -18 2x = -18 Divide each side by '2'. x = -9 Simplifying x = -9
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