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