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Simplifying 1890 = 21(p + 40) Reorder the terms: 1890 = 21(40 + p) 1890 = (40 * 21 + p * 21) 1890 = (840 + 21p) Solving 1890 = 840 + 21p Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-21p' to each side of the equation. 1890 + -21p = 840 + 21p + -21p Combine like terms: 21p + -21p = 0 1890 + -21p = 840 + 0 1890 + -21p = 840 Add '-1890' to each side of the equation. 1890 + -1890 + -21p = 840 + -1890 Combine like terms: 1890 + -1890 = 0 0 + -21p = 840 + -1890 -21p = 840 + -1890 Combine like terms: 840 + -1890 = -1050 -21p = -1050 Divide each side by '-21'. p = 50 Simplifying p = 50
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