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Simplifying -1 + -7r = 8(8r + 7) Reorder the terms: -1 + -7r = 8(7 + 8r) -1 + -7r = (7 * 8 + 8r * 8) -1 + -7r = (56 + 64r) Solving -1 + -7r = 56 + 64r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-64r' to each side of the equation. -1 + -7r + -64r = 56 + 64r + -64r Combine like terms: -7r + -64r = -71r -1 + -71r = 56 + 64r + -64r Combine like terms: 64r + -64r = 0 -1 + -71r = 56 + 0 -1 + -71r = 56 Add '1' to each side of the equation. -1 + 1 + -71r = 56 + 1 Combine like terms: -1 + 1 = 0 0 + -71r = 56 + 1 -71r = 56 + 1 Combine like terms: 56 + 1 = 57 -71r = 57 Divide each side by '-71'. r = -0.8028169014 Simplifying r = -0.8028169014
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