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Simplifying 64 = 8(r + 2) + 4r Reorder the terms: 64 = 8(2 + r) + 4r 64 = (2 * 8 + r * 8) + 4r 64 = (16 + 8r) + 4r Combine like terms: 8r + 4r = 12r 64 = 16 + 12r Solving 64 = 16 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 64 + -12r = 16 + 12r + -12r Combine like terms: 12r + -12r = 0 64 + -12r = 16 + 0 64 + -12r = 16 Add '-64' to each side of the equation. 64 + -64 + -12r = 16 + -64 Combine like terms: 64 + -64 = 0 0 + -12r = 16 + -64 -12r = 16 + -64 Combine like terms: 16 + -64 = -48 -12r = -48 Divide each side by '-12'. r = 4 Simplifying r = 4
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