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Simplifying -9 + x = -7x + 31 Reorder the terms: -9 + x = 31 + -7x Solving -9 + x = 31 + -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. -9 + x + 7x = 31 + -7x + 7x Combine like terms: x + 7x = 8x -9 + 8x = 31 + -7x + 7x Combine like terms: -7x + 7x = 0 -9 + 8x = 31 + 0 -9 + 8x = 31 Add '9' to each side of the equation. -9 + 9 + 8x = 31 + 9 Combine like terms: -9 + 9 = 0 0 + 8x = 31 + 9 8x = 31 + 9 Combine like terms: 31 + 9 = 40 8x = 40 Divide each side by '8'. x = 5 Simplifying x = 5
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