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Simplifying 6X + -9 = 3X + 21 Reorder the terms: -9 + 6X = 3X + 21 Reorder the terms: -9 + 6X = 21 + 3X Solving -9 + 6X = 21 + 3X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3X' to each side of the equation. -9 + 6X + -3X = 21 + 3X + -3X Combine like terms: 6X + -3X = 3X -9 + 3X = 21 + 3X + -3X Combine like terms: 3X + -3X = 0 -9 + 3X = 21 + 0 -9 + 3X = 21 Add '9' to each side of the equation. -9 + 9 + 3X = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 3X = 21 + 9 3X = 21 + 9 Combine like terms: 21 + 9 = 30 3X = 30 Divide each side by '3'. X = 10 Simplifying X = 10
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