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Simplifying 3(7r + -7) = -6 Reorder the terms: 3(-7 + 7r) = -6 (-7 * 3 + 7r * 3) = -6 (-21 + 21r) = -6 Solving -21 + 21r = -6 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 21r = -6 + 21 Combine like terms: -21 + 21 = 0 0 + 21r = -6 + 21 21r = -6 + 21 Combine like terms: -6 + 21 = 15 21r = 15 Divide each side by '21'. r = 0.7142857143 Simplifying r = 0.7142857143
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