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Simplifying 7r + 5r + -12 = 0 Reorder the terms: -12 + 7r + 5r = 0 Combine like terms: 7r + 5r = 12r -12 + 12r = 0 Solving -12 + 12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 12r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 12r = 0 + 12 12r = 0 + 12 Combine like terms: 0 + 12 = 12 12r = 12 Divide each side by '12'. r = 1 Simplifying r = 1
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