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Simplifying -5 + 4r + -2 = -15 Reorder the terms: -5 + -2 + 4r = -15 Combine like terms: -5 + -2 = -7 -7 + 4r = -15 Solving -7 + 4r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4r = -15 + 7 Combine like terms: -7 + 7 = 0 0 + 4r = -15 + 7 4r = -15 + 7 Combine like terms: -15 + 7 = -8 4r = -8 Divide each side by '4'. r = -2 Simplifying r = -2
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