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Simplifying (640 * 0.40) + (990 * 0.40) = 0 Multiply 640 * 0.40 (256) + (990 * 0.40) = 0 256 + (990 * 0.40) = 0 Multiply 990 * 0.40 256 + (396) = 0 256 + 396 = 0 Combine like terms: 256 + 396 = 652 652 = 0 Solving 652 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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