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Simplifying 21 = 42 + -3r Solving 21 = 42 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 21 + 3r = 42 + -3r + 3r Combine like terms: -3r + 3r = 0 21 + 3r = 42 + 0 21 + 3r = 42 Add '-21' to each side of the equation. 21 + -21 + 3r = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 3r = 42 + -21 3r = 42 + -21 Combine like terms: 42 + -21 = 21 3r = 21 Divide each side by '3'. r = 7 Simplifying r = 7
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