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Simplifying -1 + 10 + r = -9 + 4r Combine like terms: -1 + 10 = 9 9 + r = -9 + 4r Solving 9 + r = -9 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 9 + r + -4r = -9 + 4r + -4r Combine like terms: r + -4r = -3r 9 + -3r = -9 + 4r + -4r Combine like terms: 4r + -4r = 0 9 + -3r = -9 + 0 9 + -3r = -9 Add '-9' to each side of the equation. 9 + -9 + -3r = -9 + -9 Combine like terms: 9 + -9 = 0 0 + -3r = -9 + -9 -3r = -9 + -9 Combine like terms: -9 + -9 = -18 -3r = -18 Divide each side by '-3'. r = 6 Simplifying r = 6
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