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