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Simplifying 7r = 2(r + -10) Reorder the terms: 7r = 2(-10 + r) 7r = (-10 * 2 + r * 2) 7r = (-20 + 2r) Solving 7r = -20 + 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. 7r + -2r = -20 + 2r + -2r Combine like terms: 7r + -2r = 5r 5r = -20 + 2r + -2r Combine like terms: 2r + -2r = 0 5r = -20 + 0 5r = -20 Divide each side by '5'. r = -4 Simplifying r = -4
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