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Simplifying 4x + 9 = 2(2x + 9) + (-18) Reorder the terms: 9 + 4x = 2(2x + 9) + (-18) Reorder the terms: 9 + 4x = 2(9 + 2x) + (-18) 9 + 4x = (9 * 2 + 2x * 2) + (-18) 9 + 4x = (18 + 4x) + (-18) 9 + 4x = 18 + 4x + -18 Reorder the terms: 9 + 4x = 18 + -18 + 4x Combine like terms: 18 + -18 = 0 9 + 4x = 0 + 4x 9 + 4x = 4x Add '-4x' to each side of the equation. 9 + 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 9 + 0 = 4x + -4x 9 = 4x + -4x Combine like terms: 4x + -4x = 0 9 = 0 Solving 9 = 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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