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Simplifying 4(r + 3) = 4(15 + 3) Reorder the terms: 4(3 + r) = 4(15 + 3) (3 * 4 + r * 4) = 4(15 + 3) (12 + 4r) = 4(15 + 3) Combine like terms: 15 + 3 = 18 12 + 4r = 4(18) Multiply 4 * 18 12 + 4r = 72 Solving 12 + 4r = 72 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 4r = 72 + -12 Combine like terms: 12 + -12 = 0 0 + 4r = 72 + -12 4r = 72 + -12 Combine like terms: 72 + -12 = 60 4r = 60 Divide each side by '4'. r = 15 Simplifying r = 15
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