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Simplifying 1x + -1(-13 + 3x) + 12 = 13 1x + (-13 * -1 + 3x * -1) + 12 = 13 1x + (13 + -3x) + 12 = 13 Reorder the terms: 13 + 12 + 1x + -3x = 13 Combine like terms: 13 + 12 = 25 25 + 1x + -3x = 13 Combine like terms: 1x + -3x = -2x 25 + -2x = 13 Solving 25 + -2x = 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 + -2x = 13 + -25 Combine like terms: 25 + -25 = 0 0 + -2x = 13 + -25 -2x = 13 + -25 Combine like terms: 13 + -25 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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