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Simplifying -200 = -8(1 + 8r) -200 = (1 * -8 + 8r * -8) -200 = (-8 + -64r) Solving -200 = -8 + -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. -200 + 64r = -8 + -64r + 64r Combine like terms: -64r + 64r = 0 -200 + 64r = -8 + 0 -200 + 64r = -8 Add '200' to each side of the equation. -200 + 200 + 64r = -8 + 200 Combine like terms: -200 + 200 = 0 0 + 64r = -8 + 200 64r = -8 + 200 Combine like terms: -8 + 200 = 192 64r = 192 Divide each side by '64'. r = 3 Simplifying r = 3
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