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Simplifying (12 + -1r) + (5 + -1r) = 13 Remove parenthesis around (12 + -1r) 12 + -1r + (5 + -1r) = 13 Remove parenthesis around (5 + -1r) 12 + -1r + 5 + -1r = 13 Reorder the terms: 12 + 5 + -1r + -1r = 13 Combine like terms: 12 + 5 = 17 17 + -1r + -1r = 13 Combine like terms: -1r + -1r = -2r 17 + -2r = 13 Solving 17 + -2r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + -2r = 13 + -17 Combine like terms: 17 + -17 = 0 0 + -2r = 13 + -17 -2r = 13 + -17 Combine like terms: 13 + -17 = -4 -2r = -4 Divide each side by '-2'. r = 2 Simplifying r = 2
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