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Simplifying -4r + 7 + 2r = 9 Reorder the terms: 7 + -4r + 2r = 9 Combine like terms: -4r + 2r = -2r 7 + -2r = 9 Solving 7 + -2r = 9 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 + -2r = 9 + -7 Combine like terms: 7 + -7 = 0 0 + -2r = 9 + -7 -2r = 9 + -7 Combine like terms: 9 + -7 = 2 -2r = 2 Divide each side by '-2'. r = -1 Simplifying r = -1
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