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Simplifying 10 = 7r + 80 Reorder the terms: 10 = 80 + 7r Solving 10 = 80 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 10 + -7r = 80 + 7r + -7r Combine like terms: 7r + -7r = 0 10 + -7r = 80 + 0 10 + -7r = 80 Add '-10' to each side of the equation. 10 + -10 + -7r = 80 + -10 Combine like terms: 10 + -10 = 0 0 + -7r = 80 + -10 -7r = 80 + -10 Combine like terms: 80 + -10 = 70 -7r = 70 Divide each side by '-7'. r = -10 Simplifying r = -10
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