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Simplifying 42r + -42 = 0 Reorder the terms: -42 + 42r = 0 Solving -42 + 42r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 42r = 0 + 42 Combine like terms: -42 + 42 = 0 0 + 42r = 0 + 42 42r = 0 + 42 Combine like terms: 0 + 42 = 42 42r = 42 Divide each side by '42'. r = 1 Simplifying r = 1
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