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Simplifying 83 = 21 + r Solving 83 = 21 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 83 + -1r = 21 + r + -1r Combine like terms: r + -1r = 0 83 + -1r = 21 + 0 83 + -1r = 21 Add '-83' to each side of the equation. 83 + -83 + -1r = 21 + -83 Combine like terms: 83 + -83 = 0 0 + -1r = 21 + -83 -1r = 21 + -83 Combine like terms: 21 + -83 = -62 -1r = -62 Divide each side by '-1'. r = 62 Simplifying r = 62
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