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Simplifying 3 + -8(3 + 8r) = -85 3 + (3 * -8 + 8r * -8) = -85 3 + (-24 + -64r) = -85 Combine like terms: 3 + -24 = -21 -21 + -64r = -85 Solving -21 + -64r = -85 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -64r = -85 + 21 Combine like terms: -21 + 21 = 0 0 + -64r = -85 + 21 -64r = -85 + 21 Combine like terms: -85 + 21 = -64 -64r = -64 Divide each side by '-64'. r = 1 Simplifying r = 1
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