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Simplifying 28 + -3r = -1(7r + -4) Reorder the terms: 28 + -3r = -1(-4 + 7r) 28 + -3r = (-4 * -1 + 7r * -1) 28 + -3r = (4 + -7r) Solving 28 + -3r = 4 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 28 + -3r + 7r = 4 + -7r + 7r Combine like terms: -3r + 7r = 4r 28 + 4r = 4 + -7r + 7r Combine like terms: -7r + 7r = 0 28 + 4r = 4 + 0 28 + 4r = 4 Add '-28' to each side of the equation. 28 + -28 + 4r = 4 + -28 Combine like terms: 28 + -28 = 0 0 + 4r = 4 + -28 4r = 4 + -28 Combine like terms: 4 + -28 = -24 4r = -24 Divide each side by '4'. r = -6 Simplifying r = -6
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