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Simplifying 3x + -3 + 3x + -3 = 21 Reorder the terms: -3 + -3 + 3x + 3x = 21 Combine like terms: -3 + -3 = -6 -6 + 3x + 3x = 21 Combine like terms: 3x + 3x = 6x -6 + 6x = 21 Solving -6 + 6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 6x = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 6x = 21 + 6 6x = 21 + 6 Combine like terms: 21 + 6 = 27 6x = 27 Divide each side by '6'. x = 4.5 Simplifying x = 4.5
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