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Simplifying 8x + -21 = -7x + 9 Reorder the terms: -21 + 8x = -7x + 9 Reorder the terms: -21 + 8x = 9 + -7x Solving -21 + 8x = 9 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -21 + 8x + 7x = 9 + -7x + 7x Combine like terms: 8x + 7x = 15x -21 + 15x = 9 + -7x + 7x Combine like terms: -7x + 7x = 0 -21 + 15x = 9 + 0 -21 + 15x = 9 Add '21' to each side of the equation. -21 + 21 + 15x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 15x = 9 + 21 15x = 9 + 21 Combine like terms: 9 + 21 = 30 15x = 30 Divide each side by '15'. x = 2 Simplifying x = 2
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