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Simplifying 3(-7r + 5) = 15 + 7r Reorder the terms: 3(5 + -7r) = 15 + 7r (5 * 3 + -7r * 3) = 15 + 7r (15 + -21r) = 15 + 7r Add '-15' to each side of the equation. 15 + -15 + -21r = 15 + -15 + 7r Combine like terms: 15 + -15 = 0 0 + -21r = 15 + -15 + 7r -21r = 15 + -15 + 7r Combine like terms: 15 + -15 = 0 -21r = 0 + 7r -21r = 7r Solving -21r = 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. -21r + -7r = 7r + -7r Combine like terms: -21r + -7r = -28r -28r = 7r + -7r Combine like terms: 7r + -7r = 0 -28r = 0 Divide each side by '-28'. r = 0 Simplifying r = 0
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