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Simplifying 9 + r + -4 = r + 4 Reorder the terms: 9 + -4 + r = r + 4 Combine like terms: 9 + -4 = 5 5 + r = r + 4 Reorder the terms: 5 + r = 4 + r Add '-1r' to each side of the equation. 5 + r + -1r = 4 + r + -1r Combine like terms: r + -1r = 0 5 + 0 = 4 + r + -1r 5 = 4 + r + -1r Combine like terms: r + -1r = 0 5 = 4 + 0 5 = 4 Solving 5 = 4 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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