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Simplifying 4r + 90 + 68 = 180 Reorder the terms: 90 + 68 + 4r = 180 Combine like terms: 90 + 68 = 158 158 + 4r = 180 Solving 158 + 4r = 180 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-158' to each side of the equation. 158 + -158 + 4r = 180 + -158 Combine like terms: 158 + -158 = 0 0 + 4r = 180 + -158 4r = 180 + -158 Combine like terms: 180 + -158 = 22 4r = 22 Divide each side by '4'. r = 5.5 Simplifying r = 5.5
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