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Simplifying 15x + -9 = 8x + 21 Reorder the terms: -9 + 15x = 8x + 21 Reorder the terms: -9 + 15x = 21 + 8x Solving -9 + 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. -9 + 15x + -8x = 21 + 8x + -8x Combine like terms: 15x + -8x = 7x -9 + 7x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 -9 + 7x = 21 + 0 -9 + 7x = 21 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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