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