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Simplifying -2(4r + -5) = 21 Reorder the terms: -2(-5 + 4r) = 21 (-5 * -2 + 4r * -2) = 21 (10 + -8r) = 21 Solving 10 + -8r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -8r = 21 + -10 Combine like terms: 10 + -10 = 0 0 + -8r = 21 + -10 -8r = 21 + -10 Combine like terms: 21 + -10 = 11 -8r = 11 Divide each side by '-8'. r = -1.375 Simplifying r = -1.375
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