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Simplifying (x2 + 7x + 8) + -1(x2 + -2x + -5) = 0 Reorder the terms: (8 + 7x + x2) + -1(x2 + -2x + -5) = 0 Remove parenthesis around (8 + 7x + x2) 8 + 7x + x2 + -1(x2 + -2x + -5) = 0 Reorder the terms: 8 + 7x + x2 + -1(-5 + -2x + x2) = 0 8 + 7x + x2 + (-5 * -1 + -2x * -1 + x2 * -1) = 0 8 + 7x + x2 + (5 + 2x + -1x2) = 0 Reorder the terms: 8 + 5 + 7x + 2x + x2 + -1x2 = 0 Combine like terms: 8 + 5 = 13 13 + 7x + 2x + x2 + -1x2 = 0 Combine like terms: 7x + 2x = 9x 13 + 9x + x2 + -1x2 = 0 Combine like terms: x2 + -1x2 = 0 13 + 9x + 0 = 0 13 + 9x = 0 Solving 13 + 9x = 0 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 + 9x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 9x = 0 + -13 9x = 0 + -13 Combine like terms: 0 + -13 = -13 9x = -13 Divide each side by '9'. x = -1.444444444 Simplifying x = -1.444444444
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