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Simplifying 3r = 10(r + -20) Reorder the terms: 3r = 10(-20 + r) 3r = (-20 * 10 + r * 10) 3r = (-200 + 10r) Solving 3r = -200 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. 3r + -10r = -200 + 10r + -10r Combine like terms: 3r + -10r = -7r -7r = -200 + 10r + -10r Combine like terms: 10r + -10r = 0 -7r = -200 + 0 -7r = -200 Divide each side by '-7'. r = 28.57142857 Simplifying r = 28.57142857
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