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Simplifying -9 = r * 4 Reorder the terms for easier multiplication: -9 = 4r Solving -9 = 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -9 + -4r = 4r + -4r Combine like terms: 4r + -4r = 0 -9 + -4r = 0 Add '9' to each side of the equation. -9 + 9 + -4r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -4r = 0 + 9 -4r = 0 + 9 Combine like terms: 0 + 9 = 9 -4r = 9 Divide each side by '-4'. r = -2.25 Simplifying r = -2.25
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