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Simplifying -3x + 6x + -21 = 18 Reorder the terms: -21 + -3x + 6x = 18 Combine like terms: -3x + 6x = 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 = 39 3x = 39 Divide each side by '3'. x = 13 Simplifying x = 13
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