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Simplifying -2r + 4 = (-3) + 9 Reorder the terms: 4 + -2r = (-3) + 9 4 + -2r = -3 + 9 Combine like terms: -3 + 9 = 6 4 + -2r = 6 Solving 4 + -2r = 6 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -2r = 6 + -4 Combine like terms: 4 + -4 = 0 0 + -2r = 6 + -4 -2r = 6 + -4 Combine like terms: 6 + -4 = 2 -2r = 2 Divide each side by '-2'. r = -1 Simplifying r = -1
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