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Simplifying 7r + -3 = 15 + 4r Reorder the terms: -3 + 7r = 15 + 4r Solving -3 + 7r = 15 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -3 + 7r + -4r = 15 + 4r + -4r Combine like terms: 7r + -4r = 3r -3 + 3r = 15 + 4r + -4r Combine like terms: 4r + -4r = 0 -3 + 3r = 15 + 0 -3 + 3r = 15 Add '3' to each side of the equation. -3 + 3 + 3r = 15 + 3 Combine like terms: -3 + 3 = 0 0 + 3r = 15 + 3 3r = 15 + 3 Combine like terms: 15 + 3 = 18 3r = 18 Divide each side by '3'. r = 6 Simplifying r = 6
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