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Simplifying 800 = 120 * 3 + 40r Multiply 120 * 3 800 = 360 + 40r Solving 800 = 360 + 40r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-40r' to each side of the equation. 800 + -40r = 360 + 40r + -40r Combine like terms: 40r + -40r = 0 800 + -40r = 360 + 0 800 + -40r = 360 Add '-800' to each side of the equation. 800 + -800 + -40r = 360 + -800 Combine like terms: 800 + -800 = 0 0 + -40r = 360 + -800 -40r = 360 + -800 Combine like terms: 360 + -800 = -440 -40r = -440 Divide each side by '-40'. r = 11 Simplifying r = 11
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