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Simplifying 9r + -13 = -55 + 3r Reorder the terms: -13 + 9r = -55 + 3r Solving -13 + 9r = -55 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -13 + 9r + -3r = -55 + 3r + -3r Combine like terms: 9r + -3r = 6r -13 + 6r = -55 + 3r + -3r Combine like terms: 3r + -3r = 0 -13 + 6r = -55 + 0 -13 + 6r = -55 Add '13' to each side of the equation. -13 + 13 + 6r = -55 + 13 Combine like terms: -13 + 13 = 0 0 + 6r = -55 + 13 6r = -55 + 13 Combine like terms: -55 + 13 = -42 6r = -42 Divide each side by '6'. r = -7 Simplifying r = -7
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