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Simplifying -31 + -7x = -9x + 9 Reorder the terms: -31 + -7x = 9 + -9x Solving -31 + -7x = 9 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -31 + -7x + 9x = 9 + -9x + 9x Combine like terms: -7x + 9x = 2x -31 + 2x = 9 + -9x + 9x Combine like terms: -9x + 9x = 0 -31 + 2x = 9 + 0 -31 + 2x = 9 Add '31' to each side of the equation. -31 + 31 + 2x = 9 + 31 Combine like terms: -31 + 31 = 0 0 + 2x = 9 + 31 2x = 9 + 31 Combine like terms: 9 + 31 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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