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Simplifying 7r + (-3) = 2r + 72 7r + -3 = 2r + 72 Reorder the terms: -3 + 7r = 2r + 72 Reorder the terms: -3 + 7r = 72 + 2r Solving -3 + 7r = 72 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -3 + 7r + -2r = 72 + 2r + -2r Combine like terms: 7r + -2r = 5r -3 + 5r = 72 + 2r + -2r Combine like terms: 2r + -2r = 0 -3 + 5r = 72 + 0 -3 + 5r = 72 Add '3' to each side of the equation. -3 + 3 + 5r = 72 + 3 Combine like terms: -3 + 3 = 0 0 + 5r = 72 + 3 5r = 72 + 3 Combine like terms: 72 + 3 = 75 5r = 75 Divide each side by '5'. r = 15 Simplifying r = 15
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