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