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Simplifying -21 + -1X + 4X = 18 Combine like terms: -1X + 4X = 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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