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Simplifying -2 = r + 4 + -3r Reorder the terms: -2 = 4 + r + -3r Combine like terms: r + -3r = -2r -2 = 4 + -2r Solving -2 = 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. -2 + 2r = 4 + -2r + 2r Combine like terms: -2r + 2r = 0 -2 + 2r = 4 + 0 -2 + 2r = 4 Add '2' to each side of the equation. -2 + 2 + 2r = 4 + 2 Combine like terms: -2 + 2 = 0 0 + 2r = 4 + 2 2r = 4 + 2 Combine like terms: 4 + 2 = 6 2r = 6 Divide each side by '2'. r = 3 Simplifying r = 3
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