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Simplifying 2(r + -80) + 2r = 1600 Reorder the terms: 2(-80 + r) + 2r = 1600 (-80 * 2 + r * 2) + 2r = 1600 (-160 + 2r) + 2r = 1600 Combine like terms: 2r + 2r = 4r -160 + 4r = 1600 Solving -160 + 4r = 1600 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '160' to each side of the equation. -160 + 160 + 4r = 1600 + 160 Combine like terms: -160 + 160 = 0 0 + 4r = 1600 + 160 4r = 1600 + 160 Combine like terms: 1600 + 160 = 1760 4r = 1760 Divide each side by '4'. r = 440 Simplifying r = 440
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