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