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Simplifying 7x + -1(3x + -7) = 31 Reorder the terms: 7x + -1(-7 + 3x) = 31 7x + (-7 * -1 + 3x * -1) = 31 7x + (7 + -3x) = 31 Reorder the terms: 7 + 7x + -3x = 31 Combine like terms: 7x + -3x = 4x 7 + 4x = 31 Solving 7 + 4x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4x = 31 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = 31 + -7 4x = 31 + -7 Combine like terms: 31 + -7 = 24 4x = 24 Divide each side by '4'. x = 6 Simplifying x = 6
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