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Simplifying 897(x + 9) + 59(7 + -1x) = 640 Reorder the terms: 897(9 + x) + 59(7 + -1x) = 640 (9 * 897 + x * 897) + 59(7 + -1x) = 640 (8073 + 897x) + 59(7 + -1x) = 640 8073 + 897x + (7 * 59 + -1x * 59) = 640 8073 + 897x + (413 + -59x) = 640 Reorder the terms: 8073 + 413 + 897x + -59x = 640 Combine like terms: 8073 + 413 = 8486 8486 + 897x + -59x = 640 Combine like terms: 897x + -59x = 838x 8486 + 838x = 640 Solving 8486 + 838x = 640 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8486' to each side of the equation. 8486 + -8486 + 838x = 640 + -8486 Combine like terms: 8486 + -8486 = 0 0 + 838x = 640 + -8486 838x = 640 + -8486 Combine like terms: 640 + -8486 = -7846 838x = -7846 Divide each side by '838'. x = -9.362768496 Simplifying x = -9.362768496
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