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Simplifying 31 + 4x + -1 = 40 Reorder the terms: 31 + -1 + 4x = 40 Combine like terms: 31 + -1 = 30 30 + 4x = 40 Solving 30 + 4x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 4x = 40 + -30 Combine like terms: 30 + -30 = 0 0 + 4x = 40 + -30 4x = 40 + -30 Combine like terms: 40 + -30 = 10 4x = 10 Divide each side by '4'. x = 2.5 Simplifying x = 2.5
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