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Simplifying 0.8r + 0.5(90) = 700 Multiply 0.5 * 90 0.8r + 45 = 700 Reorder the terms: 45 + 0.8r = 700 Solving 45 + 0.8r = 700 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 + 0.8r = 700 + -45 Combine like terms: 45 + -45 = 0 0 + 0.8r = 700 + -45 0.8r = 700 + -45 Combine like terms: 700 + -45 = 655 0.8r = 655 Divide each side by '0.8'. r = 818.75 Simplifying r = 818.75
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