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Simplifying 215 + r + 165 + 2r = 2x Reorder the terms: 215 + 165 + r + 2r = 2x Combine like terms: 215 + 165 = 380 380 + r + 2r = 2x Combine like terms: r + 2r = 3r 380 + 3r = 2x Solving 380 + 3r = 2x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-380' to each side of the equation. 380 + -380 + 3r = -380 + 2x Combine like terms: 380 + -380 = 0 0 + 3r = -380 + 2x 3r = -380 + 2x Divide each side by '3'. r = -126.6666667 + 0.6666666667x Simplifying r = -126.6666667 + 0.6666666667x
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