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Simplifying 3 = 8(10 + 2r) 3 = (10 * 8 + 2r * 8) 3 = (80 + 16r) Solving 3 = 80 + 16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16r' to each side of the equation. 3 + -16r = 80 + 16r + -16r Combine like terms: 16r + -16r = 0 3 + -16r = 80 + 0 3 + -16r = 80 Add '-3' to each side of the equation. 3 + -3 + -16r = 80 + -3 Combine like terms: 3 + -3 = 0 0 + -16r = 80 + -3 -16r = 80 + -3 Combine like terms: 80 + -3 = 77 -16r = 77 Divide each side by '-16'. r = -4.8125 Simplifying r = -4.8125
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