\(y+y:3.7.5+y:2.13=252\\ < =>y+\dfrac{35y}{3}+\dfrac{13y}{2}=252\\ < =>\left(1+\dfrac{35}{3}+\dfrac{13}{2}\right)y=252\\ < =>\dfrac{115}{6}y=252\\ =>y=\dfrac{252}{\dfrac{115}{6}}=\dfrac{1512}{115}\)
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