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Simplifying 19r + 2r + -8r + -12r + 5 = 28 Reorder the terms: 5 + 19r + 2r + -8r + -12r = 28 Combine like terms: 19r + 2r = 21r 5 + 21r + -8r + -12r = 28 Combine like terms: 21r + -8r = 13r 5 + 13r + -12r = 28 Combine like terms: 13r + -12r = 1r 5 + 1r = 28 Solving 5 + 1r = 28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 1r = 28 + -5 Combine like terms: 5 + -5 = 0 0 + 1r = 28 + -5 1r = 28 + -5 Combine like terms: 28 + -5 = 23 1r = 23 Divide each side by '1'. r = 23 Simplifying r = 23
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