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Simplifying 4(4 + -1r) + 1 = 13 (4 * 4 + -1r * 4) + 1 = 13 (16 + -4r) + 1 = 13 Reorder the terms: 16 + 1 + -4r = 13 Combine like terms: 16 + 1 = 17 17 + -4r = 13 Solving 17 + -4r = 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 + -4r = 13 + -17 Combine like terms: 17 + -17 = 0 0 + -4r = 13 + -17 -4r = 13 + -17 Combine like terms: 13 + -17 = -4 -4r = -4 Divide each side by '-4'. r = 1 Simplifying r = 1
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