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Simplifying 6x + 21 + -3x = 18 Reorder the terms: 21 + 6x + -3x = 18 Combine like terms: 6x + -3x = 3x 21 + 3x = 18 Solving 21 + 3x = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 18 + -21 3x = 18 + -21 Combine like terms: 18 + -21 = -3 3x = -3 Divide each side by '3'. x = -1 Simplifying x = -1
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