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Simplifying 8r + -21 = -21 + 7r Reorder the terms: -21 + 8r = -21 + 7r Add '21' to each side of the equation. -21 + 21 + 8r = -21 + 21 + 7r Combine like terms: -21 + 21 = 0 0 + 8r = -21 + 21 + 7r 8r = -21 + 21 + 7r Combine like terms: -21 + 21 = 0 8r = 0 + 7r 8r = 7r Solving 8r = 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. 8r + -7r = 7r + -7r Combine like terms: 8r + -7r = 1r 1r = 7r + -7r Combine like terms: 7r + -7r = 0 1r = 0 Divide each side by '1'. r = 0 Simplifying r = 0
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