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Simplifying 12p + 6r = 7p + 21r Solving 12p + 6r = 7p + 21r Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-7p' to each side of the equation. 12p + -7p + 6r = 7p + -7p + 21r Combine like terms: 12p + -7p = 5p 5p + 6r = 7p + -7p + 21r Combine like terms: 7p + -7p = 0 5p + 6r = 0 + 21r 5p + 6r = 21r Add '-6r' to each side of the equation. 5p + 6r + -6r = 21r + -6r Combine like terms: 6r + -6r = 0 5p + 0 = 21r + -6r 5p = 21r + -6r Combine like terms: 21r + -6r = 15r 5p = 15r Divide each side by '5'. p = 3r Simplifying p = 3r
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