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Simplifying 10 = 30 + -2r Solving 10 = 30 + -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. 10 + 2r = 30 + -2r + 2r Combine like terms: -2r + 2r = 0 10 + 2r = 30 + 0 10 + 2r = 30 Add '-10' to each side of the equation. 10 + -10 + 2r = 30 + -10 Combine like terms: 10 + -10 = 0 0 + 2r = 30 + -10 2r = 30 + -10 Combine like terms: 30 + -10 = 20 2r = 20 Divide each side by '2'. r = 10 Simplifying r = 10
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