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Simplifying 5 + 7r + 3 = 5(r + -4) Reorder the terms: 5 + 3 + 7r = 5(r + -4) Combine like terms: 5 + 3 = 8 8 + 7r = 5(r + -4) Reorder the terms: 8 + 7r = 5(-4 + r) 8 + 7r = (-4 * 5 + r * 5) 8 + 7r = (-20 + 5r) Solving 8 + 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. 8 + 7r + -5r = -20 + 5r + -5r Combine like terms: 7r + -5r = 2r 8 + 2r = -20 + 5r + -5r Combine like terms: 5r + -5r = 0 8 + 2r = -20 + 0 8 + 2r = -20 Add '-8' to each side of the equation. 8 + -8 + 2r = -20 + -8 Combine like terms: 8 + -8 = 0 0 + 2r = -20 + -8 2r = -20 + -8 Combine like terms: -20 + -8 = -28 2r = -28 Divide each side by '2'. r = -14 Simplifying r = -14
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