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Simplifying 3r + -1(2r + 1) = 21 Reorder the terms: 3r + -1(1 + 2r) = 21 3r + (1 * -1 + 2r * -1) = 21 3r + (-1 + -2r) = 21 Reorder the terms: -1 + 3r + -2r = 21 Combine like terms: 3r + -2r = 1r -1 + 1r = 21 Solving -1 + 1r = 21 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 = 21 + 1 Combine like terms: -1 + 1 = 0 0 + 1r = 21 + 1 1r = 21 + 1 Combine like terms: 21 + 1 = 22 1r = 22 Divide each side by '1'. r = 22 Simplifying r = 22
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