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x - 30 = .2 (x + 70)

 Jun 13, 2021
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$$ x - 30 = \frac{1}{5}(x+70) \\ x-30 = \frac{x}{5} + 14 \\ \frac{4}{5}x = 44 \\ x = \boxed{55} $$

 

Thus, $55$ is our answer. 

 Jun 13, 2021

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