[tex]0,7a + 0,3(a - 20)=0,7a+0,3a-6=a-6\\\\3,7-6=-2,3[/tex]
[tex]1,2(a - 10) - 0,8(5 - a)=1,2a-12-4+0,8a=2a-16\\\\2\cdot\frac{1}{2}-16=1-16=-15[/tex]
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[tex]0,7a + 0,3(a - 20)=0,7a+0,3a-6=a-6\\\\3,7-6=-2,3[/tex]
[tex]1,2(a - 10) - 0,8(5 - a)=1,2a-12-4+0,8a=2a-16\\\\2\cdot\frac{1}{2}-16=1-16=-15[/tex]