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Simplifying 3x + 13 = x * x + -25 + -1(x * x + 1) Reorder the terms: 13 + 3x = x * x + -25 + -1(x * x + 1) Multiply x * x 13 + 3x = x2 + -25 + -1(x * x + 1) Multiply x * x 13 + 3x = x2 + -25 + -1(x2 + 1) Reorder the terms: 13 + 3x = x2 + -25 + -1(1 + x2) 13 + 3x = x2 + -25 + (1 * -1 + x2 * -1) 13 + 3x = x2 + -25 + (-1 + -1x2) Reorder the terms: 13 + 3x = -25 + -1 + x2 + -1x2 Combine like terms: -25 + -1 = -26 13 + 3x = -26 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 13 + 3x = -26 + 0 13 + 3x = -26 Solving 13 + 3x = -26 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 3x = -26 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = -26 + -13 3x = -26 + -13 Combine like terms: -26 + -13 = -39 3x = -39 Divide each side by '3'. x = -13 Simplifying x = -13
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