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Simplifying 2r = 7(r + -15) Reorder the terms: 2r = 7(-15 + r) 2r = (-15 * 7 + r * 7) 2r = (-105 + 7r) Solving 2r = -105 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. 2r + -7r = -105 + 7r + -7r Combine like terms: 2r + -7r = -5r -5r = -105 + 7r + -7r Combine like terms: 7r + -7r = 0 -5r = -105 + 0 -5r = -105 Divide each side by '-5'. r = 21 Simplifying r = 21
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