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Simplifying 2X + -21 = 30 + -1X Reorder the terms: -21 + 2X = 30 + -1X Solving -21 + 2X = 30 + -1X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add 'X' to each side of the equation. -21 + 2X + X = 30 + -1X + X Combine like terms: 2X + X = 3X -21 + 3X = 30 + -1X + X Combine like terms: -1X + X = 0 -21 + 3X = 30 + 0 -21 + 3X = 30 Add '21' to each side of the equation. -21 + 21 + 3X = 30 + 21 Combine like terms: -21 + 21 = 0 0 + 3X = 30 + 21 3X = 30 + 21 Combine like terms: 30 + 21 = 51 3X = 51 Divide each side by '3'. X = 17 Simplifying X = 17
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