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Simplifying 7r + 21 = r + -9 Reorder the terms: 21 + 7r = r + -9 Reorder the terms: 21 + 7r = -9 + r Solving 21 + 7r = -9 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 21 + 7r + -1r = -9 + r + -1r Combine like terms: 7r + -1r = 6r 21 + 6r = -9 + r + -1r Combine like terms: r + -1r = 0 21 + 6r = -9 + 0 21 + 6r = -9 Add '-21' to each side of the equation. 21 + -21 + 6r = -9 + -21 Combine like terms: 21 + -21 = 0 0 + 6r = -9 + -21 6r = -9 + -21 Combine like terms: -9 + -21 = -30 6r = -30 Divide each side by '6'. r = -5 Simplifying r = -5
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