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