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Simplifying -9 = 3r + 45 Reorder the terms: -9 = 45 + 3r Solving -9 = 45 + 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. -9 + -3r = 45 + 3r + -3r Combine like terms: 3r + -3r = 0 -9 + -3r = 45 + 0 -9 + -3r = 45 Add '9' to each side of the equation. -9 + 9 + -3r = 45 + 9 Combine like terms: -9 + 9 = 0 0 + -3r = 45 + 9 -3r = 45 + 9 Combine like terms: 45 + 9 = 54 -3r = 54 Divide each side by '-3'. r = -18 Simplifying r = -18
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