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