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Simplifying 9 + -1r = (r + 1) Reorder the terms: 9 + -1r = (1 + r) Remove parenthesis around (1 + r) 9 + -1r = 1 + r Solving 9 + -1r = 1 + 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. 9 + -1r + -1r = 1 + r + -1r Combine like terms: -1r + -1r = -2r 9 + -2r = 1 + r + -1r Combine like terms: r + -1r = 0 9 + -2r = 1 + 0 9 + -2r = 1 Add '-9' to each side of the equation. 9 + -9 + -2r = 1 + -9 Combine like terms: 9 + -9 = 0 0 + -2r = 1 + -9 -2r = 1 + -9 Combine like terms: 1 + -9 = -8 -2r = -8 Divide each side by '-2'. r = 4 Simplifying r = 4
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