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Simplifying 391 = 7(1 + -7x) + -8 391 = (1 * 7 + -7x * 7) + -8 391 = (7 + -49x) + -8 Reorder the terms: 391 = 7 + -8 + -49x Combine like terms: 7 + -8 = -1 391 = -1 + -49x Solving 391 = -1 + -49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49x' to each side of the equation. 391 + 49x = -1 + -49x + 49x Combine like terms: -49x + 49x = 0 391 + 49x = -1 + 0 391 + 49x = -1 Add '-391' to each side of the equation. 391 + -391 + 49x = -1 + -391 Combine like terms: 391 + -391 = 0 0 + 49x = -1 + -391 49x = -1 + -391 Combine like terms: -1 + -391 = -392 49x = -392 Divide each side by '49'. x = -8 Simplifying x = -8
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