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Simplifying 690 + 3r + 80 + 110 = 0 Reorder the terms: 690 + 80 + 110 + 3r = 0 Combine like terms: 690 + 80 = 770 770 + 110 + 3r = 0 Combine like terms: 770 + 110 = 880 880 + 3r = 0 Solving 880 + 3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-880' to each side of the equation. 880 + -880 + 3r = 0 + -880 Combine like terms: 880 + -880 = 0 0 + 3r = 0 + -880 3r = 0 + -880 Combine like terms: 0 + -880 = -880 3r = -880 Divide each side by '3'. r = -293.3333333 Simplifying r = -293.3333333
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