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Simplifying -7 + -8(5x + 8) = -391 Reorder the terms: -7 + -8(8 + 5x) = -391 -7 + (8 * -8 + 5x * -8) = -391 -7 + (-64 + -40x) = -391 Combine like terms: -7 + -64 = -71 -71 + -40x = -391 Solving -71 + -40x = -391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '71' to each side of the equation. -71 + 71 + -40x = -391 + 71 Combine like terms: -71 + 71 = 0 0 + -40x = -391 + 71 -40x = -391 + 71 Combine like terms: -391 + 71 = -320 -40x = -320 Divide each side by '-40'. x = 8 Simplifying x = 8
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