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Simplifying 8(8 + 8r) = -7 + -7r (8 * 8 + 8r * 8) = -7 + -7r (64 + 64r) = -7 + -7r Solving 64 + 64r = -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. 64 + 64r + 7r = -7 + -7r + 7r Combine like terms: 64r + 7r = 71r 64 + 71r = -7 + -7r + 7r Combine like terms: -7r + 7r = 0 64 + 71r = -7 + 0 64 + 71r = -7 Add '-64' to each side of the equation. 64 + -64 + 71r = -7 + -64 Combine like terms: 64 + -64 = 0 0 + 71r = -7 + -64 71r = -7 + -64 Combine like terms: -7 + -64 = -71 71r = -71 Divide each side by '71'. r = -1 Simplifying r = -1
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