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Simplifying 30 = 20 + 2r Solving 30 = 20 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 30 + -2r = 20 + 2r + -2r Combine like terms: 2r + -2r = 0 30 + -2r = 20 + 0 30 + -2r = 20 Add '-30' to each side of the equation. 30 + -30 + -2r = 20 + -30 Combine like terms: 30 + -30 = 0 0 + -2r = 20 + -30 -2r = 20 + -30 Combine like terms: 20 + -30 = -10 -2r = -10 Divide each side by '-2'. r = 5 Simplifying r = 5
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