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