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Simplifying -7(-3 + -9x) = x (-3 * -7 + -9x * -7) = x (21 + 63x) = x Solving 21 + 63x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 21 + 63x + -1x = x + -1x Combine like terms: 63x + -1x = 62x 21 + 62x = x + -1x Combine like terms: x + -1x = 0 21 + 62x = 0 Add '-21' to each side of the equation. 21 + -21 + 62x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 62x = 0 + -21 62x = 0 + -21 Combine like terms: 0 + -21 = -21 62x = -21 Divide each side by '62'. x = -0.3387096774 Simplifying x = -0.3387096774
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