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Simplifying 2r + -1(r + 3) = 21 Reorder the terms: 2r + -1(3 + r) = 21 2r + (3 * -1 + r * -1) = 21 2r + (-3 + -1r) = 21 Reorder the terms: -3 + 2r + -1r = 21 Combine like terms: 2r + -1r = 1r -3 + 1r = 21 Solving -3 + 1r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 1r = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 1r = 21 + 3 1r = 21 + 3 Combine like terms: 21 + 3 = 24 1r = 24 Divide each side by '1'. r = 24 Simplifying r = 24
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