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Simplifying (3 + r) + -9 = r Remove parenthesis around (3 + r) 3 + r + -9 = r Reorder the terms: 3 + -9 + r = r Combine like terms: 3 + -9 = -6 -6 + r = r Add '-1r' to each side of the equation. -6 + r + -1r = r + -1r Combine like terms: r + -1r = 0 -6 + 0 = r + -1r -6 = r + -1r Combine like terms: r + -1r = 0 -6 = 0 Solving -6 = 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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