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Simplifying 2 + -5r = 12 + -25 Combine like terms: 12 + -25 = -13 2 + -5r = -13 Solving 2 + -5r = -13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -5r = -13 + -2 Combine like terms: 2 + -2 = 0 0 + -5r = -13 + -2 -5r = -13 + -2 Combine like terms: -13 + -2 = -15 -5r = -15 Divide each side by '-5'. r = 3 Simplifying r = 3
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