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