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Simplifying 13x + -21 = 18 Reorder the terms: -21 + 13x = 18 Solving -21 + 13x = 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 + 13x = 18 + 21 Combine like terms: -21 + 21 = 0 0 + 13x = 18 + 21 13x = 18 + 21 Combine like terms: 18 + 21 = 39 13x = 39 Divide each side by '13'. x = 3 Simplifying x = 3
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