1.Найти значение переменной z:
[tex]- \frac{7}{10} (0,6 z + \frac{2}{5} ) + 0,3 ( \frac{3}{5} z +0,4)=0[/tex]
1)[tex]-1,5[/tex]
2)[tex]- \frac{2}{3} [/tex]
3)[tex]\frac{2}{3} [/tex]
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