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Simplifying 3x + -1(x + 1) = 139 Reorder the terms: 3x + -1(1 + x) = 139 3x + (1 * -1 + x * -1) = 139 3x + (-1 + -1x) = 139 Reorder the terms: -1 + 3x + -1x = 139 Combine like terms: 3x + -1x = 2x -1 + 2x = 139 Solving -1 + 2x = 139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 2x = 139 + 1 Combine like terms: -1 + 1 = 0 0 + 2x = 139 + 1 2x = 139 + 1 Combine like terms: 139 + 1 = 140 2x = 140 Divide each side by '2'. x = 70 Simplifying x = 70
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