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Simplifying 68 + -1r = 21 Solving 68 + -1r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-68' to each side of the equation. 68 + -68 + -1r = 21 + -68 Combine like terms: 68 + -68 = 0 0 + -1r = 21 + -68 -1r = 21 + -68 Combine like terms: 21 + -68 = -47 -1r = -47 Divide each side by '-1'. r = 47 Simplifying r = 47
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