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Simplifying 7r + 2r = 42r + 7 Combine like terms: 7r + 2r = 9r 9r = 42r + 7 Reorder the terms: 9r = 7 + 42r Solving 9r = 7 + 42r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42r' to each side of the equation. 9r + -42r = 7 + 42r + -42r Combine like terms: 9r + -42r = -33r -33r = 7 + 42r + -42r Combine like terms: 42r + -42r = 0 -33r = 7 + 0 -33r = 7 Divide each side by '-33'. r = -0.2121212121 Simplifying r = -0.2121212121
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