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Simplifying 7x + -3(x + -1) = 31 Reorder the terms: 7x + -3(-1 + x) = 31 7x + (-1 * -3 + x * -3) = 31 7x + (3 + -3x) = 31 Reorder the terms: 3 + 7x + -3x = 31 Combine like terms: 7x + -3x = 4x 3 + 4x = 31 Solving 3 + 4x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4x = 31 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 31 + -3 4x = 31 + -3 Combine like terms: 31 + -3 = 28 4x = 28 Divide each side by '4'. x = 7 Simplifying x = 7
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