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Simplifying -39 = -4r + -7 Reorder the terms: -39 = -7 + -4r Solving -39 = -7 + -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. -39 + 4r = -7 + -4r + 4r Combine like terms: -4r + 4r = 0 -39 + 4r = -7 + 0 -39 + 4r = -7 Add '39' to each side of the equation. -39 + 39 + 4r = -7 + 39 Combine like terms: -39 + 39 = 0 0 + 4r = -7 + 39 4r = -7 + 39 Combine like terms: -7 + 39 = 32 4r = 32 Divide each side by '4'. r = 8 Simplifying r = 8
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