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Simplifying -7 + 28 = -7 + -3r Combine like terms: -7 + 28 = 21 21 = -7 + -3r Solving 21 = -7 + -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. 21 + 3r = -7 + -3r + 3r Combine like terms: -3r + 3r = 0 21 + 3r = -7 + 0 21 + 3r = -7 Add '-21' to each side of the equation. 21 + -21 + 3r = -7 + -21 Combine like terms: 21 + -21 = 0 0 + 3r = -7 + -21 3r = -7 + -21 Combine like terms: -7 + -21 = -28 3r = -28 Divide each side by '3'. r = -9.333333333 Simplifying r = -9.333333333
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