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Simplifying 2r + 7 + 4r = 15 Reorder the terms: 7 + 2r + 4r = 15 Combine like terms: 2r + 4r = 6r 7 + 6r = 15 Solving 7 + 6r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 6r = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 6r = 15 + -7 6r = 15 + -7 Combine like terms: 15 + -7 = 8 6r = 8 Divide each side by '6'. r = 1.333333333 Simplifying r = 1.333333333
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