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Simplifying 7 + -1(2 + 2r) = 20 7 + (2 * -1 + 2r * -1) = 20 7 + (-2 + -2r) = 20 Combine like terms: 7 + -2 = 5 5 + -2r = 20 Solving 5 + -2r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2r = 20 + -5 Combine like terms: 5 + -5 = 0 0 + -2r = 20 + -5 -2r = 20 + -5 Combine like terms: 20 + -5 = 15 -2r = 15 Divide each side by '-2'. r = -7.5 Simplifying r = -7.5
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