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Simplifying 78 = -10 + 8r Solving 78 = -10 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 78 + -8r = -10 + 8r + -8r Combine like terms: 8r + -8r = 0 78 + -8r = -10 + 0 78 + -8r = -10 Add '-78' to each side of the equation. 78 + -78 + -8r = -10 + -78 Combine like terms: 78 + -78 = 0 0 + -8r = -10 + -78 -8r = -10 + -78 Combine like terms: -10 + -78 = -88 -8r = -88 Divide each side by '-8'. r = 11 Simplifying r = 11
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