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Simplifying 75 = -5(3 + 3r) 75 = (3 * -5 + 3r * -5) 75 = (-15 + -15r) Solving 75 = -15 + -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 = -15 + -15r + 15r Combine like terms: -15r + 15r = 0 75 + 15r = -15 + 0 75 + 15r = -15 Add '-75' to each side of the equation. 75 + -75 + 15r = -15 + -75 Combine like terms: 75 + -75 = 0 0 + 15r = -15 + -75 15r = -15 + -75 Combine like terms: -15 + -75 = -90 15r = -90 Divide each side by '15'. r = -6 Simplifying r = -6
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