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Simplifying 30 = 19 + -1r Solving 30 = 19 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 30 + r = 19 + -1r + r Combine like terms: -1r + r = 0 30 + r = 19 + 0 30 + r = 19 Add '-30' to each side of the equation. 30 + -30 + r = 19 + -30 Combine like terms: 30 + -30 = 0 0 + r = 19 + -30 r = 19 + -30 Combine like terms: 19 + -30 = -11 r = -11 Simplifying r = -11
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