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Simplifying 7r + -4 = -20 + 5r Reorder the terms: -4 + 7r = -20 + 5r Solving -4 + 7r = -20 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. -4 + 7r + -5r = -20 + 5r + -5r Combine like terms: 7r + -5r = 2r -4 + 2r = -20 + 5r + -5r Combine like terms: 5r + -5r = 0 -4 + 2r = -20 + 0 -4 + 2r = -20 Add '4' to each side of the equation. -4 + 4 + 2r = -20 + 4 Combine like terms: -4 + 4 = 0 0 + 2r = -20 + 4 2r = -20 + 4 Combine like terms: -20 + 4 = -16 2r = -16 Divide each side by '2'. r = -8 Simplifying r = -8
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