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Simplifying 10x + -9 = 21 + -5x Reorder the terms: -9 + 10x = 21 + -5x Solving -9 + 10x = 21 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. -9 + 10x + 5x = 21 + -5x + 5x Combine like terms: 10x + 5x = 15x -9 + 15x = 21 + -5x + 5x Combine like terms: -5x + 5x = 0 -9 + 15x = 21 + 0 -9 + 15x = 21 Add '9' to each side of the equation. -9 + 9 + 15x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 15x = 21 + 9 15x = 21 + 9 Combine like terms: 21 + 9 = 30 15x = 30 Divide each side by '15'. x = 2 Simplifying x = 2
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