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Simplifying -7 + -2r = -4r + 9 Reorder the terms: -7 + -2r = 9 + -4r Solving -7 + -2r = 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. -7 + -2r + 4r = 9 + -4r + 4r Combine like terms: -2r + 4r = 2r -7 + 2r = 9 + -4r + 4r Combine like terms: -4r + 4r = 0 -7 + 2r = 9 + 0 -7 + 2r = 9 Add '7' to each side of the equation. -7 + 7 + 2r = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 2r = 9 + 7 2r = 9 + 7 Combine like terms: 9 + 7 = 16 2r = 16 Divide each side by '2'. r = 8 Simplifying r = 8
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