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Simplifying 9x + -7(x + -1) = 0 Reorder the terms: 9x + -7(-1 + x) = 0 9x + (-1 * -7 + x * -7) = 0 9x + (7 + -7x) = 0 Reorder the terms: 7 + 9x + -7x = 0 Combine like terms: 9x + -7x = 2x 7 + 2x = 0 Solving 7 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 2x = 0 + -7 2x = 0 + -7 Combine like terms: 0 + -7 = -7 2x = -7 Divide each side by '2'. x = -3.5 Simplifying x = -3.5
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