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Simplifying -11 + -7 = 3r Combine like terms: -11 + -7 = -18 -18 = 3r Solving -18 = 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -18 + -3r = 3r + -3r Combine like terms: 3r + -3r = 0 -18 + -3r = 0 Add '18' to each side of the equation. -18 + 18 + -3r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -3r = 0 + 18 -3r = 0 + 18 Combine like terms: 0 + 18 = 18 -3r = 18 Divide each side by '-3'. r = -6 Simplifying r = -6
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