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Simplifying 7x + -1(4 + 2x) = 31 7x + (4 * -1 + 2x * -1) = 31 7x + (-4 + -2x) = 31 Reorder the terms: -4 + 7x + -2x = 31 Combine like terms: 7x + -2x = 5x -4 + 5x = 31 Solving -4 + 5x = 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 + 5x = 31 + 4 Combine like terms: -4 + 4 = 0 0 + 5x = 31 + 4 5x = 31 + 4 Combine like terms: 31 + 4 = 35 5x = 35 Divide each side by '5'. x = 7 Simplifying x = 7
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