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Simplifying 210 = 7r Solving 210 = 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. 210 + -7r = 7r + -7r Combine like terms: 7r + -7r = 0 210 + -7r = 0 Add '-210' to each side of the equation. 210 + -210 + -7r = 0 + -210 Combine like terms: 210 + -210 = 0 0 + -7r = 0 + -210 -7r = 0 + -210 Combine like terms: 0 + -210 = -210 -7r = -210 Divide each side by '-7'. r = 30 Simplifying r = 30
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