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Simplifying (7x + 9) + -1(5x + 5) = 0 Reorder the terms: (9 + 7x) + -1(5x + 5) = 0 Remove parenthesis around (9 + 7x) 9 + 7x + -1(5x + 5) = 0 Reorder the terms: 9 + 7x + -1(5 + 5x) = 0 9 + 7x + (5 * -1 + 5x * -1) = 0 9 + 7x + (-5 + -5x) = 0 Reorder the terms: 9 + -5 + 7x + -5x = 0 Combine like terms: 9 + -5 = 4 4 + 7x + -5x = 0 Combine like terms: 7x + -5x = 2x 4 + 2x = 0 Solving 4 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 2x = 0 + -4 2x = 0 + -4 Combine like terms: 0 + -4 = -4 2x = -4 Divide each side by '2'. x = -2 Simplifying x = -2
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