Помогите решить уравнения: 1)1,3-0,6c=0,2-0,5c
2)0,3a+0,4=6-0,7a
3)1,3z+0,8=0,7z-1
4)-3x+7,5=-0,5x
5)0,8c-0,1=-0,2c
6)1,9-1,5z=0,1-0,5z
7)-0,6+1,6a=0,4a
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