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Simplifying 8(-8r + 5) = 40 + 7r Reorder the terms: 8(5 + -8r) = 40 + 7r (5 * 8 + -8r * 8) = 40 + 7r (40 + -64r) = 40 + 7r Add '-40' to each side of the equation. 40 + -40 + -64r = 40 + -40 + 7r Combine like terms: 40 + -40 = 0 0 + -64r = 40 + -40 + 7r -64r = 40 + -40 + 7r Combine like terms: 40 + -40 = 0 -64r = 0 + 7r -64r = 7r Solving -64r = 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. -64r + -7r = 7r + -7r Combine like terms: -64r + -7r = -71r -71r = 7r + -7r Combine like terms: 7r + -7r = 0 -71r = 0 Divide each side by '-71'. r = 0 Simplifying r = 0
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