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Simplifying 5x + 2x + -4 = 31 Reorder the terms: -4 + 5x + 2x = 31 Combine like terms: 5x + 2x = 7x -4 + 7x = 31 Solving -4 + 7x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 7x = 31 + 4 Combine like terms: -4 + 4 = 0 0 + 7x = 31 + 4 7x = 31 + 4 Combine like terms: 31 + 4 = 35 7x = 35 Divide each side by '7'. x = 5 Simplifying x = 5
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