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Simplifying 6r + -21 + 6r + -15 = 0 Reorder the terms: -21 + -15 + 6r + 6r = 0 Combine like terms: -21 + -15 = -36 -36 + 6r + 6r = 0 Combine like terms: 6r + 6r = 12r -36 + 12r = 0 Solving -36 + 12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 12r = 0 + 36 Combine like terms: -36 + 36 = 0 0 + 12r = 0 + 36 12r = 0 + 36 Combine like terms: 0 + 36 = 36 12r = 36 Divide each side by '12'. r = 3 Simplifying r = 3
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