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Simplifying X * 7 + -9 = 21 Reorder the terms for easier multiplication: 7X + -9 = 21 Reorder the terms: -9 + 7X = 21 Solving -9 + 7X = 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 + 7X = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 7X = 21 + 9 7X = 21 + 9 Combine like terms: 21 + 9 = 30 7X = 30 Divide each side by '7'. X = 4.285714286 Simplifying X = 4.285714286
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