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Simplifying -9 + 4r = -15 Solving -9 + 4r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 4r = -15 + 9 Combine like terms: -9 + 9 = 0 0 + 4r = -15 + 9 4r = -15 + 9 Combine like terms: -15 + 9 = -6 4r = -6 Divide each side by '4'. r = -1.5 Simplifying r = -1.5
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