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Simplifying 4(x + 5) + -4x = 9 Reorder the terms: 4(5 + x) + -4x = 9 (5 * 4 + x * 4) + -4x = 9 (20 + 4x) + -4x = 9 Combine like terms: 4x + -4x = 0 20 + 0 = 9 20 = 9 Solving 20 = 9 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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