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Simplifying 10x + 7 = 10x + 9 Reorder the terms: 7 + 10x = 10x + 9 Reorder the terms: 7 + 10x = 9 + 10x Add '-10x' to each side of the equation. 7 + 10x + -10x = 9 + 10x + -10x Combine like terms: 10x + -10x = 0 7 + 0 = 9 + 10x + -10x 7 = 9 + 10x + -10x Combine like terms: 10x + -10x = 0 7 = 9 + 0 7 = 9 Solving 7 = 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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