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Simplifying 49 = 70 + -1r Solving 49 = 70 + -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. 49 + r = 70 + -1r + r Combine like terms: -1r + r = 0 49 + r = 70 + 0 49 + r = 70 Add '-49' to each side of the equation. 49 + -49 + r = 70 + -49 Combine like terms: 49 + -49 = 0 0 + r = 70 + -49 r = 70 + -49 Combine like terms: 70 + -49 = 21 r = 21 Simplifying r = 21
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