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