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Simplifying 3r + -1(2r + -1) = 7 Reorder the terms: 3r + -1(-1 + 2r) = 7 3r + (-1 * -1 + 2r * -1) = 7 3r + (1 + -2r) = 7 Reorder the terms: 1 + 3r + -2r = 7 Combine like terms: 3r + -2r = 1r 1 + 1r = 7 Solving 1 + 1r = 7 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 = 7 + -1 Combine like terms: 1 + -1 = 0 0 + 1r = 7 + -1 1r = 7 + -1 Combine like terms: 7 + -1 = 6 1r = 6 Divide each side by '1'. r = 6 Simplifying r = 6
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