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Simplifying 15x = 8x + 21 Reorder the terms: 15x = 21 + 8x Solving 15x = 21 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 15x + -8x = 21 + 8x + -8x Combine like terms: 15x + -8x = 7x 7x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 7x = 21 + 0 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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