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Simplifying 12r + r + -12r + -1 = 19 Reorder the terms: -1 + 12r + r + -12r = 19 Combine like terms: 12r + r = 13r -1 + 13r + -12r = 19 Combine like terms: 13r + -12r = 1r -1 + 1r = 19 Solving -1 + 1r = 19 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1r = 19 + 1 Combine like terms: -1 + 1 = 0 0 + 1r = 19 + 1 1r = 19 + 1 Combine like terms: 19 + 1 = 20 1r = 20 Divide each side by '1'. r = 20 Simplifying r = 20
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