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Simplifying 525 = 6r + 3(r + -20) Reorder the terms: 525 = 6r + 3(-20 + r) 525 = 6r + (-20 * 3 + r * 3) 525 = 6r + (-60 + 3r) Reorder the terms: 525 = -60 + 6r + 3r Combine like terms: 6r + 3r = 9r 525 = -60 + 9r Solving 525 = -60 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 525 + -9r = -60 + 9r + -9r Combine like terms: 9r + -9r = 0 525 + -9r = -60 + 0 525 + -9r = -60 Add '-525' to each side of the equation. 525 + -525 + -9r = -60 + -525 Combine like terms: 525 + -525 = 0 0 + -9r = -60 + -525 -9r = -60 + -525 Combine like terms: -60 + -525 = -585 -9r = -585 Divide each side by '-9'. r = 65 Simplifying r = 65
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