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Simplifying 3 + 7x + -1(2 + 9x) = 0 3 + 7x + (2 * -1 + 9x * -1) = 0 3 + 7x + (-2 + -9x) = 0 Reorder the terms: 3 + -2 + 7x + -9x = 0 Combine like terms: 3 + -2 = 1 1 + 7x + -9x = 0 Combine like terms: 7x + -9x = -2x 1 + -2x = 0 Solving 1 + -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2x = 0 + -1 -2x = 0 + -1 Combine like terms: 0 + -1 = -1 -2x = -1 Divide each side by '-2'. x = 0.5 Simplifying x = 0.5
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