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Simplifying 6 + -2(8 + -2r) = 20 6 + (8 * -2 + -2r * -2) = 20 6 + (-16 + 4r) = 20 Combine like terms: 6 + -16 = -10 -10 + 4r = 20 Solving -10 + 4r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 4r = 20 + 10 Combine like terms: -10 + 10 = 0 0 + 4r = 20 + 10 4r = 20 + 10 Combine like terms: 20 + 10 = 30 4r = 30 Divide each side by '4'. r = 7.5 Simplifying r = 7.5
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