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Simplifying 21 = 15 + -1r Solving 21 = 15 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 21 + r = 15 + -1r + r Combine like terms: -1r + r = 0 21 + r = 15 + 0 21 + r = 15 Add '-21' to each side of the equation. 21 + -21 + r = 15 + -21 Combine like terms: 21 + -21 = 0 0 + r = 15 + -21 r = 15 + -21 Combine like terms: 15 + -21 = -6 r = -6 Simplifying r = -6
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