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Simplifying 21 + -4p = 7 + -2p Solving 21 + -4p = 7 + -2p Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2p' to each side of the equation. 21 + -4p + 2p = 7 + -2p + 2p Combine like terms: -4p + 2p = -2p 21 + -2p = 7 + -2p + 2p Combine like terms: -2p + 2p = 0 21 + -2p = 7 + 0 21 + -2p = 7 Add '-21' to each side of the equation. 21 + -21 + -2p = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2p = 7 + -21 -2p = 7 + -21 Combine like terms: 7 + -21 = -14 -2p = -14 Divide each side by '-2'. p = 7 Simplifying p = 7
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