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Simplifying 4r + -9 = r Reorder the terms: -9 + 4r = r Solving -9 + 4r = 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 + 4r + -1r = r + -1r Combine like terms: 4r + -1r = 3r -9 + 3r = r + -1r Combine like terms: r + -1r = 0 -9 + 3r = 0 Add '9' to each side of the equation. -9 + 9 + 3r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 3r = 0 + 9 3r = 0 + 9 Combine like terms: 0 + 9 = 9 3r = 9 Divide each side by '3'. r = 3 Simplifying r = 3
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