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Simplifying 3r + -28 = -12 + r Reorder the terms: -28 + 3r = -12 + r Solving -28 + 3r = -12 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -28 + 3r + -1r = -12 + r + -1r Combine like terms: 3r + -1r = 2r -28 + 2r = -12 + r + -1r Combine like terms: r + -1r = 0 -28 + 2r = -12 + 0 -28 + 2r = -12 Add '28' to each side of the equation. -28 + 28 + 2r = -12 + 28 Combine like terms: -28 + 28 = 0 0 + 2r = -12 + 28 2r = -12 + 28 Combine like terms: -12 + 28 = 16 2r = 16 Divide each side by '2'. r = 8 Simplifying r = 8
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