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Simplifying 21 = 42 + 7r Solving 21 = 42 + 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. 21 + -7r = 42 + 7r + -7r Combine like terms: 7r + -7r = 0 21 + -7r = 42 + 0 21 + -7r = 42 Add '-21' to each side of the equation. 21 + -21 + -7r = 42 + -21 Combine like terms: 21 + -21 = 0 0 + -7r = 42 + -21 -7r = 42 + -21 Combine like terms: 42 + -21 = 21 -7r = 21 Divide each side by '-7'. r = -3 Simplifying r = -3
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