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Simplifying 3r + 21 = 10r Reorder the terms: 21 + 3r = 10r Solving 21 + 3r = 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. 21 + 3r + -10r = 10r + -10r Combine like terms: 3r + -10r = -7r 21 + -7r = 10r + -10r Combine like terms: 10r + -10r = 0 21 + -7r = 0 Add '-21' to each side of the equation. 21 + -21 + -7r = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7r = 0 + -21 -7r = 0 + -21 Combine like terms: 0 + -21 = -21 -7r = -21 Divide each side by '-7'. r = 3 Simplifying r = 3
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