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Simplifying 9 = 16 + (-1r) Solving 9 = 16 + (-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. 9 + (r) = 16 + (-1r) + (r) 9 + r = 16 + (-1r) + (r) 9 + r = 16 + (-1r) + r Combine like terms: (-1r) + r = 0 9 + r = 16 + 0 9 + r = 16 Add '-9' to each side of the equation. 9 + -9 + r = 16 + -9 Combine like terms: 9 + -9 = 0 0 + r = 16 + -9 r = 16 + -9 Combine like terms: 16 + -9 = 7 r = 7 Simplifying r = 7
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