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Simplifying -7x + 9 + 8x = -20 + 21 Reorder the terms: 9 + -7x + 8x = -20 + 21 Combine like terms: -7x + 8x = 1x 9 + 1x = -20 + 21 Combine like terms: -20 + 21 = 1 9 + 1x = 1 Solving 9 + 1x = 1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 1x = 1 + -9 Combine like terms: 9 + -9 = 0 0 + 1x = 1 + -9 1x = 1 + -9 Combine like terms: 1 + -9 = -8 1x = -8 Divide each side by '1'. x = -8 Simplifying x = -8
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