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Simplifying 75 = -20r + (-3r) + (2r) Combine like terms: -20r + (-3r) = -23r 75 = -23r + (2r) Combine like terms: -23r + (2r) = -21r 75 = -21r Solving 75 = -21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21r' to each side of the equation. 75 + 21r = -21r + 21r Combine like terms: -21r + 21r = 0 75 + 21r = 0 Add '-75' to each side of the equation. 75 + -75 + 21r = 0 + -75 Combine like terms: 75 + -75 = 0 0 + 21r = 0 + -75 21r = 0 + -75 Combine like terms: 0 + -75 = -75 21r = -75 Divide each side by '21'. r = -3.571428571 Simplifying r = -3.571428571
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