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Simplifying -21 = 7r + 21 Reorder the terms: -21 = 21 + 7r Solving -21 = 21 + 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 = 21 + 7r + -7r Combine like terms: 7r + -7r = 0 -21 + -7r = 21 + 0 -21 + -7r = 21 Add '21' to each side of the equation. -21 + 21 + -7r = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -7r = 21 + 21 -7r = 21 + 21 Combine like terms: 21 + 21 = 42 -7r = 42 Divide each side by '-7'. r = -6 Simplifying r = -6
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