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Simplifying -11 = r + 7 + -3r Reorder the terms: -11 = 7 + r + -3r Combine like terms: r + -3r = -2r -11 = 7 + -2r Solving -11 = 7 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. -11 + 2r = 7 + -2r + 2r Combine like terms: -2r + 2r = 0 -11 + 2r = 7 + 0 -11 + 2r = 7 Add '11' to each side of the equation. -11 + 11 + 2r = 7 + 11 Combine like terms: -11 + 11 = 0 0 + 2r = 7 + 11 2r = 7 + 11 Combine like terms: 7 + 11 = 18 2r = 18 Divide each side by '2'. r = 9 Simplifying r = 9
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