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