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Simplifying 3r + -1(4r + -5) = 21 Reorder the terms: 3r + -1(-5 + 4r) = 21 3r + (-5 * -1 + 4r * -1) = 21 3r + (5 + -4r) = 21 Reorder the terms: 5 + 3r + -4r = 21 Combine like terms: 3r + -4r = -1r 5 + -1r = 21 Solving 5 + -1r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1r = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 21 + -5 -1r = 21 + -5 Combine like terms: 21 + -5 = 16 -1r = 16 Divide each side by '-1'. r = -16 Simplifying r = -16
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