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Simplifying 75 = 20r + (-3r) + (-2r) Combine like terms: 20r + (-3r) = 17r 75 = 17r + (-2r) Combine like terms: 17r + (-2r) = 15r 75 = 15r Solving 75 = 15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15r' to each side of the equation. 75 + -15r = 15r + -15r Combine like terms: 15r + -15r = 0 75 + -15r = 0 Add '-75' to each side of the equation. 75 + -75 + -15r = 0 + -75 Combine like terms: 75 + -75 = 0 0 + -15r = 0 + -75 -15r = 0 + -75 Combine like terms: 0 + -75 = -75 -15r = -75 Divide each side by '-15'. r = 5 Simplifying r = 5
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