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Simplifying 5(x + -1) + 4x = 31 Reorder the terms: 5(-1 + x) + 4x = 31 (-1 * 5 + x * 5) + 4x = 31 (-5 + 5x) + 4x = 31 Combine like terms: 5x + 4x = 9x -5 + 9x = 31 Solving -5 + 9x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 9x = 31 + 5 Combine like terms: -5 + 5 = 0 0 + 9x = 31 + 5 9x = 31 + 5 Combine like terms: 31 + 5 = 36 9x = 36 Divide each side by '9'. x = 4 Simplifying x = 4
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