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Simplifying -11 = 1 + 3r + r Combine like terms: 3r + r = 4r -11 = 1 + 4r Solving -11 = 1 + 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. -11 + -4r = 1 + 4r + -4r Combine like terms: 4r + -4r = 0 -11 + -4r = 1 + 0 -11 + -4r = 1 Add '11' to each side of the equation. -11 + 11 + -4r = 1 + 11 Combine like terms: -11 + 11 = 0 0 + -4r = 1 + 11 -4r = 1 + 11 Combine like terms: 1 + 11 = 12 -4r = 12 Divide each side by '-4'. r = -3 Simplifying r = -3
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