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Simplifying 64 = -4(-6 + -5r) 64 = (-6 * -4 + -5r * -4) 64 = (24 + 20r) Solving 64 = 24 + 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. 64 + -20r = 24 + 20r + -20r Combine like terms: 20r + -20r = 0 64 + -20r = 24 + 0 64 + -20r = 24 Add '-64' to each side of the equation. 64 + -64 + -20r = 24 + -64 Combine like terms: 64 + -64 = 0 0 + -20r = 24 + -64 -20r = 24 + -64 Combine like terms: 24 + -64 = -40 -20r = -40 Divide each side by '-20'. r = 2 Simplifying r = 2
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