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Simplifying 21 = 6r + 5 + -7r Reorder the terms: 21 = 5 + 6r + -7r Combine like terms: 6r + -7r = -1r 21 = 5 + -1r Solving 21 = 5 + -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 = 5 + -1r + r Combine like terms: -1r + r = 0 21 + r = 5 + 0 21 + r = 5 Add '-21' to each side of the equation. 21 + -21 + r = 5 + -21 Combine like terms: 21 + -21 = 0 0 + r = 5 + -21 r = 5 + -21 Combine like terms: 5 + -21 = -16 r = -16 Simplifying r = -16
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