упростите выражения : 2.5(4a-8c)-1.4(3a-4c)

-(-5.2-3.1к)-(2.4к-6.4)

 

уравнения : 0.3(8-3у)=3.2-0.8(у-7)

0.6х-5.4= -0.8х+5.8 

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