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Simplifying 104 = 4(5 + 3r) 104 = (5 * 4 + 3r * 4) 104 = (20 + 12r) Solving 104 = 20 + 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. 104 + -12r = 20 + 12r + -12r Combine like terms: 12r + -12r = 0 104 + -12r = 20 + 0 104 + -12r = 20 Add '-104' to each side of the equation. 104 + -104 + -12r = 20 + -104 Combine like terms: 104 + -104 = 0 0 + -12r = 20 + -104 -12r = 20 + -104 Combine like terms: 20 + -104 = -84 -12r = -84 Divide each side by '-12'. r = 7 Simplifying r = 7
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