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Simplifying 3x + -9 = 21 Reorder the terms: -9 + 3x = 21 Solving -9 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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