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Simplifying 7x + -1(-13 + 3x) + 12 = 13 7x + (-13 * -1 + 3x * -1) + 12 = 13 7x + (13 + -3x) + 12 = 13 Reorder the terms: 13 + 12 + 7x + -3x = 13 Combine like terms: 13 + 12 = 25 25 + 7x + -3x = 13 Combine like terms: 7x + -3x = 4x 25 + 4x = 13 Solving 25 + 4x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 4x = 13 + -25 Combine like terms: 25 + -25 = 0 0 + 4x = 13 + -25 4x = 13 + -25 Combine like terms: 13 + -25 = -12 4x = -12 Divide each side by '4'. x = -3 Simplifying x = -3
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