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Simplifying 45 + -8r = 405 Solving 45 + -8r = 405 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + -8r = 405 + -45 Combine like terms: 45 + -45 = 0 0 + -8r = 405 + -45 -8r = 405 + -45 Combine like terms: 405 + -45 = 360 -8r = 360 Divide each side by '-8'. r = -45 Simplifying r = -45
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