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Simplifying (4x + 9) + (12 + -4x) = 0 Reorder the terms: (9 + 4x) + (12 + -4x) = 0 Remove parenthesis around (9 + 4x) 9 + 4x + (12 + -4x) = 0 Remove parenthesis around (12 + -4x) 9 + 4x + 12 + -4x = 0 Reorder the terms: 9 + 12 + 4x + -4x = 0 Combine like terms: 9 + 12 = 21 21 + 4x + -4x = 0 Combine like terms: 4x + -4x = 0 21 + 0 = 0 21 = 0 Solving 21 = 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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