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Simplifying 15r + -4 = 7r + 12 Reorder the terms: -4 + 15r = 7r + 12 Reorder the terms: -4 + 15r = 12 + 7r Solving -4 + 15r = 12 + 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. -4 + 15r + -7r = 12 + 7r + -7r Combine like terms: 15r + -7r = 8r -4 + 8r = 12 + 7r + -7r Combine like terms: 7r + -7r = 0 -4 + 8r = 12 + 0 -4 + 8r = 12 Add '4' to each side of the equation. -4 + 4 + 8r = 12 + 4 Combine like terms: -4 + 4 = 0 0 + 8r = 12 + 4 8r = 12 + 4 Combine like terms: 12 + 4 = 16 8r = 16 Divide each side by '8'. r = 2 Simplifying r = 2
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