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Simplifying 28 + 8r = -7(r + -3) + 7 Reorder the terms: 28 + 8r = -7(-3 + r) + 7 28 + 8r = (-3 * -7 + r * -7) + 7 28 + 8r = (21 + -7r) + 7 Reorder the terms: 28 + 8r = 21 + 7 + -7r Combine like terms: 21 + 7 = 28 28 + 8r = 28 + -7r Add '-28' to each side of the equation. 28 + -28 + 8r = 28 + -28 + -7r Combine like terms: 28 + -28 = 0 0 + 8r = 28 + -28 + -7r 8r = 28 + -28 + -7r Combine like terms: 28 + -28 = 0 8r = 0 + -7r 8r = -7r Solving 8r = -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. 8r + 7r = -7r + 7r Combine like terms: 8r + 7r = 15r 15r = -7r + 7r Combine like terms: -7r + 7r = 0 15r = 0 Divide each side by '15'. r = 0 Simplifying r = 0
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