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Simplifying 8r + -7 = 70 + r Reorder the terms: -7 + 8r = 70 + r Solving -7 + 8r = 70 + r 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 + 8r + -1r = 70 + r + -1r Combine like terms: 8r + -1r = 7r -7 + 7r = 70 + r + -1r Combine like terms: r + -1r = 0 -7 + 7r = 70 + 0 -7 + 7r = 70 Add '7' to each side of the equation. -7 + 7 + 7r = 70 + 7 Combine like terms: -7 + 7 = 0 0 + 7r = 70 + 7 7r = 70 + 7 Combine like terms: 70 + 7 = 77 7r = 77 Divide each side by '7'. r = 11 Simplifying r = 11
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