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Simplifying 4(7r + -7) = -28 + 8r Reorder the terms: 4(-7 + 7r) = -28 + 8r (-7 * 4 + 7r * 4) = -28 + 8r (-28 + 28r) = -28 + 8r Add '28' to each side of the equation. -28 + 28 + 28r = -28 + 28 + 8r Combine like terms: -28 + 28 = 0 0 + 28r = -28 + 28 + 8r 28r = -28 + 28 + 8r Combine like terms: -28 + 28 = 0 28r = 0 + 8r 28r = 8r Solving 28r = 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 28r + -8r = 8r + -8r Combine like terms: 28r + -8r = 20r 20r = 8r + -8r Combine like terms: 8r + -8r = 0 20r = 0 Divide each side by '20'. r = 0.0 Simplifying r = 0.0
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