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Simplifying -30 = 5(4r + -9) Reorder the terms: -30 = 5(-9 + 4r) -30 = (-9 * 5 + 4r * 5) -30 = (-45 + 20r) Solving -30 = -45 + 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. -30 + -20r = -45 + 20r + -20r Combine like terms: 20r + -20r = 0 -30 + -20r = -45 + 0 -30 + -20r = -45 Add '30' to each side of the equation. -30 + 30 + -20r = -45 + 30 Combine like terms: -30 + 30 = 0 0 + -20r = -45 + 30 -20r = -45 + 30 Combine like terms: -45 + 30 = -15 -20r = -15 Divide each side by '-20'. r = 0.75 Simplifying r = 0.75
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